diff --git a/toolchain/check/testdata/interop/cpp/function_decl.carbon b/toolchain/check/testdata/interop/cpp/function_decl.carbon
index fad080cfcdfa..e10f11557291 100644
--- a/toolchain/check/testdata/interop/cpp/function_decl.carbon
+++ b/toolchain/check/testdata/interop/cpp/function_decl.carbon
@@ -28,32 +28,79 @@ fn F() {
 
 auto foo_float() -> float;
 
-// --- fail_import_float_return_function_decl.carbon
+// --- fail_todo_import_float_return_function_decl.carbon
 
 library "[[@TEST_NAME]]";
 
 import Cpp library "float_return_function_decl.h";
 
 fn F() {
-  // CHECK:STDERR: fail_import_float_return_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: return type: float` [SemanticsTodo]
+  // CHECK:STDERR: fail_todo_import_float_return_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: return type: float` [SemanticsTodo]
   // CHECK:STDERR:   Cpp.foo_float();
   // CHECK:STDERR:   ^~~~~~~~~~~~~
-  // CHECK:STDERR: fail_import_float_return_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo_float` [InCppNameLookup]
+  // CHECK:STDERR: fail_todo_import_float_return_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo_float` [InCppNameLookup]
   // CHECK:STDERR:   Cpp.foo_float();
   // CHECK:STDERR:   ^~~~~~~~~~~~~
   // CHECK:STDERR:
   Cpp.foo_float();
 }
 
-// --- single_int_param_function_decl.h
+// --- int_param_function_decl.h
 
-auto foo(int b) -> void;
+auto foo(int a) -> void;
 
-// --- import_single_int_param_function_decl.carbon
+// --- import_int_param_function_decl.carbon
 
 library "[[@TEST_NAME]]";
 
-import Cpp library "single_int_param_function_decl.h";
+import Cpp library "int_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
+
+// --- signed_int_param_function_decl.h
+
+auto foo(signed int a) -> void;
+
+// --- import_signed_int_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "signed_int_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
+
+// --- signed_param_function_decl.h
+
+auto foo(signed a) -> void;
+
+// --- import_signed_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "signed_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
+
+// --- int32_t_param_function_decl.h
+
+namespace std {
+  // Mimicking glibc definition for int32_t: https://codebrowser.dev/glibc/glibc/posix/bits/types.h.html#__int32_t
+  typedef signed int int32_t;
+}
+
+auto foo(std::int32_t a) -> void;
+
+// --- import_int32_t_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int32_t_param_function_decl.h";
 
 fn F() {
   Cpp.foo(1);
@@ -108,21 +155,87 @@ fn F() {
 
 auto foo(int a = 0) -> void;
 
-// --- fail_int_default_param_parameterless_call.carbon
+// --- fail_todo_int_default_param_parameterless_call.carbon
 
 library "[[@TEST_NAME]]";
 
 import Cpp library "int_default_param_function_decl.h";
 
 fn F() {
-  // CHECK:STDERR: fail_int_default_param_parameterless_call.carbon:[[@LINE+5]]:3: error: 0 arguments passed to function expecting 1 argument [CallArgCountMismatch]
+  // CHECK:STDERR: fail_todo_int_default_param_parameterless_call.carbon:[[@LINE+5]]:3: error: 0 arguments passed to function expecting 1 argument [CallArgCountMismatch]
   // CHECK:STDERR:   Cpp.foo();
   // CHECK:STDERR:   ^~~~~~~~~
-  // CHECK:STDERR: fail_int_default_param_parameterless_call.carbon: note: calling function declared here [InCallToEntity]
+  // CHECK:STDERR: fail_todo_int_default_param_parameterless_call.carbon: note: calling function declared here [InCallToEntity]
   // CHECK:STDERR:
   Cpp.foo();
 }
 
+// --- int_max_param_function_decl.h
+
+auto foo(int a) -> void;
+
+// --- import_int_max_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_max_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(0x7FFF_FFFF);
+}
+
+// --- overflow_int_max_param_function_decl.h
+
+auto foo(int a) -> void;
+
+// --- fail_overflow_int_max_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "overflow_int_max_param_function_decl.h";
+
+fn F() {
+  // CHECK:STDERR: fail_overflow_int_max_param_function_decl.carbon:[[@LINE+5]]:11: error: integer value 2147483648 too large for type `i32` [IntTooLargeForType]
+  // CHECK:STDERR:   Cpp.foo(0x8000_0000);
+  // CHECK:STDERR:           ^~~~~~~~~~~
+  // CHECK:STDERR: fail_overflow_int_max_param_function_decl.carbon: note: initializing function parameter [InCallToFunctionParam]
+  // CHECK:STDERR:
+  Cpp.foo(0x8000_0000);
+}
+
+// --- int_min_param_function_decl.h
+
+auto foo(int a) -> void;
+
+// --- import_int_min_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_min_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(-0x8000_0000);
+}
+
+// --- overflow_int_min_param_function_decl.h
+
+auto foo(int a) -> void;
+
+// --- fail_overflow_int_min_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "overflow_int_min_param_function_decl.h";
+
+fn F() {
+  // CHECK:STDERR: fail_overflow_int_min_param_function_decl.carbon:[[@LINE+5]]:11: error: integer value -2147483649 too large for type `i32` [IntTooLargeForType]
+  // CHECK:STDERR:   Cpp.foo(-0x8000_0001);
+  // CHECK:STDERR:           ^~~~~~~~~~~~
+  // CHECK:STDERR: fail_overflow_int_min_param_function_decl.carbon: note: initializing function parameter [InCallToFunctionParam]
+  // CHECK:STDERR:
+  Cpp.foo(-0x8000_0001);
+}
+
 // --- import_int_default_param_sucessful_call_function_decl.carbon
 
 library "[[@TEST_NAME]]";
@@ -133,12 +246,25 @@ fn F() {
   Cpp.foo(1);
 }
 
+// --- int_const_param_function_decl.h
+
+auto foo(const int a) -> void;
+
+// --- import_int_const_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_const_param_function_decl.h";
+
+fn F() {
+  Cpp.foo(1);
+}
 
 // --- int_ref_param_function_decl.h
 
 auto foo(int& a) -> int;
 
-// --- fail_int_ref_param_function_decl.carbon
+// --- fail_todo_int_ref_param_function_decl.carbon
 
 library "[[@TEST_NAME]]";
 
@@ -146,10 +272,32 @@ import Cpp library "int_ref_param_function_decl.h";
 
 fn F() {
   var a: i32 = 1;
-  // CHECK:STDERR: fail_int_ref_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: int &` [SemanticsTodo]
+  // CHECK:STDERR: fail_todo_int_ref_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: int &` [SemanticsTodo]
   // CHECK:STDERR:   Cpp.foo(a);
   // CHECK:STDERR:   ^~~~~~~
-  // CHECK:STDERR: fail_int_ref_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR: fail_todo_int_ref_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo(a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR:
+  Cpp.foo(a);
+}
+
+// --- int_const_ref_param_function_decl.h
+
+auto foo(const int& a) -> int;
+
+// --- fail_todo_int_const_ref_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_const_ref_param_function_decl.h";
+
+fn F() {
+  var a : i32 = 1;
+  // CHECK:STDERR: fail_todo_int_const_ref_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: const int &` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo(a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR: fail_todo_int_const_ref_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
   // CHECK:STDERR:   Cpp.foo(a);
   // CHECK:STDERR:   ^~~~~~~
   // CHECK:STDERR:
@@ -160,7 +308,7 @@ fn F() {
 
 auto foo(int* a) -> void;
 
-// --- fail_int_pointer_param_function_decl.carbon
+// --- fail_todo_int_pointer_param_function_decl.carbon
 
 library "[[@TEST_NAME]]";
 
@@ -168,10 +316,32 @@ import Cpp library "int_pointer_param_function_decl.h";
 
 fn F() {
   var a: i32 = 1;
-  // CHECK:STDERR: fail_int_pointer_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: int *` [SemanticsTodo]
+  // CHECK:STDERR: fail_todo_int_pointer_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: int *` [SemanticsTodo]
   // CHECK:STDERR:   Cpp.foo(&a);
   // CHECK:STDERR:   ^~~~~~~
-  // CHECK:STDERR: fail_int_pointer_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR: fail_todo_int_pointer_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR:   Cpp.foo(&a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR:
+  Cpp.foo(&a);
+}
+
+// --- int_const_pointer_param_function_decl.h
+
+auto foo(const int* a) -> int;
+
+// --- fail_todo_int_const_pointer_param_function_decl.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "int_const_pointer_param_function_decl.h";
+
+fn F() {
+  var a : i32 = 1;
+  // CHECK:STDERR: fail_todo_int_const_pointer_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: const int *` [SemanticsTodo]
+  // CHECK:STDERR:   Cpp.foo(&a);
+  // CHECK:STDERR:   ^~~~~~~
+  // CHECK:STDERR: fail_todo_int_const_pointer_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
   // CHECK:STDERR:   Cpp.foo(&a);
   // CHECK:STDERR:   ^~~~~~~
   // CHECK:STDERR:
@@ -182,17 +352,17 @@ fn F() {
 
 auto foo(float a) -> void;
 
-// --- fail_import_unsupported_primitive_type_param_function_decl.carbon
+// --- fail_todo_import_unsupported_primitive_type_param_function_decl.carbon
 
 library "[[@TEST_NAME]]";
 
 import Cpp library "unsupported_primitive_type_param_function_decl.h";
 
 fn F() {
-  // CHECK:STDERR: fail_import_unsupported_primitive_type_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: float` [SemanticsTodo]
+  // CHECK:STDERR: fail_todo_import_unsupported_primitive_type_param_function_decl.carbon:[[@LINE+7]]:3: error: semantics TODO: `Unsupported: parameter type: float` [SemanticsTodo]
   // CHECK:STDERR:   Cpp.foo(1.1);
   // CHECK:STDERR:   ^~~~~~~
-  // CHECK:STDERR: fail_import_unsupported_primitive_type_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
+  // CHECK:STDERR: fail_todo_import_unsupported_primitive_type_param_function_decl.carbon:[[@LINE+4]]:3: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
   // CHECK:STDERR:   Cpp.foo(1.1);
   // CHECK:STDERR:   ^~~~~~~
   // CHECK:STDERR:
@@ -294,7 +464,7 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @foo_int();
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- fail_import_float_return_function_decl.carbon
+// CHECK:STDOUT: --- fail_todo_import_float_return_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
@@ -332,7 +502,7 @@ fn F() {
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- import_single_int_param_function_decl.carbon
+// CHECK:STDOUT: --- import_int_param_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
@@ -388,7 +558,253 @@ fn F() {
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %Core.import = import Core
 // CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
-// CHECK:STDOUT:     import Cpp "single_int_param_function_decl.h"
+// CHECK:STDOUT:     import Cpp "int_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_signed_int_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "signed_int_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_signed_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "signed_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_int32_t_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int32_t_param_function_decl.h"
 // CHECK:STDOUT:   }
 // CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
 // CHECK:STDOUT: }
@@ -725,7 +1141,7 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @foo();
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- fail_int_default_param_parameterless_call.carbon
+// CHECK:STDOUT: --- fail_todo_int_default_param_parameterless_call.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
@@ -776,6 +1192,370 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @foo();
 // CHECK:STDOUT:
+// CHECK:STDOUT: --- import_int_max_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_2147483647.d89: Core.IntLiteral = int_value 2147483647 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_2147483647.d89, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_2147483647.d89, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_2147483647.a74: %i32 = int_value 2147483647 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_max_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_2147483647: Core.IntLiteral = int_value 2147483647 [concrete = constants.%int_2147483647.d89]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_2147483647, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_2147483647, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_2147483647) [concrete = constants.%int_2147483647.a74]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_2147483647.a74]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_2147483647, %.loc7_11.1 [concrete = constants.%int_2147483647.a74]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_overflow_int_max_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_2147483648.1db: Core.IntLiteral = int_value 2147483648 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_2147483648.1db, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_2147483648.1db, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_2147483648.8df: %i32 = int_value 2147483648 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "overflow_int_max_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_2147483648: Core.IntLiteral = int_value 2147483648 [concrete = constants.%int_2147483648.1db]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc12_11.1: <bound method> = bound_method %int_2147483648, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc12_11.2: <bound method> = bound_method %int_2147483648, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc12_11.2(%int_2147483648) [concrete = constants.%int_2147483648.8df]
+// CHECK:STDOUT:   %.loc12_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_2147483648.8df]
+// CHECK:STDOUT:   %.loc12_11.2: %i32 = converted %int_2147483648, %.loc12_11.1 [concrete = constants.%int_2147483648.8df]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc12_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- import_int_min_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_2147483648: Core.IntLiteral = int_value 2147483648 [concrete]
+// CHECK:STDOUT:   %Negate.type: type = facet_type <@Negate> [concrete]
+// CHECK:STDOUT:   %Op.type.e42: type = fn_type @Op.1 [concrete]
+// CHECK:STDOUT:   %Negate.impl_witness.561: <witness> = impl_witness imports.%Negate.impl_witness_table.e09 [concrete]
+// CHECK:STDOUT:   %Negate.facet: %Negate.type = facet_value Core.IntLiteral, (%Negate.impl_witness.561) [concrete]
+// CHECK:STDOUT:   %.63a: type = fn_type_with_self_type %Op.type.e42, %Negate.facet [concrete]
+// CHECK:STDOUT:   %Op.type.1be: type = fn_type @Op.2 [concrete]
+// CHECK:STDOUT:   %Op.bba: %Op.type.1be = struct_value () [concrete]
+// CHECK:STDOUT:   %Op.bound: <bound method> = bound_method %int_2147483648, %Op.bba [concrete]
+// CHECK:STDOUT:   %int_-2147483648.3b9: Core.IntLiteral = int_value -2147483648 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_-2147483648.3b9, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_-2147483648.3b9, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_-2147483648.95c: %i32 = int_value -2147483648 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .Negate = %Core.Negate
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.Negate: type = import_ref Core//prelude/operators/arithmetic, Negate, loaded [concrete = constants.%Negate.type]
+// CHECK:STDOUT:   %Core.import_ref.c15: %Op.type.1be = import_ref Core//prelude/operators/arithmetic, loc94_31, loaded [concrete = constants.%Op.bba]
+// CHECK:STDOUT:   %Negate.impl_witness_table.e09 = impl_witness_table (%Core.import_ref.c15), @impl.8cb [concrete]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_min_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_2147483648: Core.IntLiteral = int_value 2147483648 [concrete = constants.%int_2147483648]
+// CHECK:STDOUT:   %impl.elem0.loc7_11.1: %.63a = impl_witness_access constants.%Negate.impl_witness.561, element0 [concrete = constants.%Op.bba]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_2147483648, %impl.elem0.loc7_11.1 [concrete = constants.%Op.bound]
+// CHECK:STDOUT:   %int.snegate: init Core.IntLiteral = call %bound_method.loc7_11.1(%int_2147483648) [concrete = constants.%int_-2147483648.3b9]
+// CHECK:STDOUT:   %impl.elem0.loc7_11.2: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int.snegate, %impl.elem0.loc7_11.2 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0.loc7_11.2, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.3: <bound method> = bound_method %int.snegate, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %.loc7_11.1: Core.IntLiteral = value_of_initializer %int.snegate [concrete = constants.%int_-2147483648.3b9]
+// CHECK:STDOUT:   %.loc7_11.2: Core.IntLiteral = converted %int.snegate, %.loc7_11.1 [concrete = constants.%int_-2147483648.3b9]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.3(%.loc7_11.2) [concrete = constants.%int_-2147483648.95c]
+// CHECK:STDOUT:   %.loc7_11.3: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_-2147483648.95c]
+// CHECK:STDOUT:   %.loc7_11.4: %i32 = converted %int.snegate, %.loc7_11.3 [concrete = constants.%int_-2147483648.95c]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.4)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_overflow_int_min_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_2147483649: Core.IntLiteral = int_value 2147483649 [concrete]
+// CHECK:STDOUT:   %Negate.type: type = facet_type <@Negate> [concrete]
+// CHECK:STDOUT:   %Op.type.e42: type = fn_type @Op.1 [concrete]
+// CHECK:STDOUT:   %Negate.impl_witness.561: <witness> = impl_witness imports.%Negate.impl_witness_table.e09 [concrete]
+// CHECK:STDOUT:   %Negate.facet: %Negate.type = facet_value Core.IntLiteral, (%Negate.impl_witness.561) [concrete]
+// CHECK:STDOUT:   %.63a: type = fn_type_with_self_type %Op.type.e42, %Negate.facet [concrete]
+// CHECK:STDOUT:   %Op.type.1be: type = fn_type @Op.2 [concrete]
+// CHECK:STDOUT:   %Op.bba: %Op.type.1be = struct_value () [concrete]
+// CHECK:STDOUT:   %Op.bound: <bound method> = bound_method %int_2147483649, %Op.bba [concrete]
+// CHECK:STDOUT:   %int_-2147483649.df1: Core.IntLiteral = int_value -2147483649 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_-2147483649.df1, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_-2147483649.df1, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_-2147483649.74e: %i32 = int_value -2147483649 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .Negate = %Core.Negate
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.Negate: type = import_ref Core//prelude/operators/arithmetic, Negate, loaded [concrete = constants.%Negate.type]
+// CHECK:STDOUT:   %Core.import_ref.c15: %Op.type.1be = import_ref Core//prelude/operators/arithmetic, loc94_31, loaded [concrete = constants.%Op.bba]
+// CHECK:STDOUT:   %Negate.impl_witness_table.e09 = impl_witness_table (%Core.import_ref.c15), @impl.8cb [concrete]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "overflow_int_min_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_2147483649: Core.IntLiteral = int_value 2147483649 [concrete = constants.%int_2147483649]
+// CHECK:STDOUT:   %impl.elem0.loc12_11.1: %.63a = impl_witness_access constants.%Negate.impl_witness.561, element0 [concrete = constants.%Op.bba]
+// CHECK:STDOUT:   %bound_method.loc12_11.1: <bound method> = bound_method %int_2147483649, %impl.elem0.loc12_11.1 [concrete = constants.%Op.bound]
+// CHECK:STDOUT:   %int.snegate: init Core.IntLiteral = call %bound_method.loc12_11.1(%int_2147483649) [concrete = constants.%int_-2147483649.df1]
+// CHECK:STDOUT:   %impl.elem0.loc12_11.2: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc12_11.2: <bound method> = bound_method %int.snegate, %impl.elem0.loc12_11.2 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0.loc12_11.2, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc12_11.3: <bound method> = bound_method %int.snegate, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %.loc12_11.1: Core.IntLiteral = value_of_initializer %int.snegate [concrete = constants.%int_-2147483649.df1]
+// CHECK:STDOUT:   %.loc12_11.2: Core.IntLiteral = converted %int.snegate, %.loc12_11.1 [concrete = constants.%int_-2147483649.df1]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc12_11.3(%.loc12_11.2) [concrete = constants.%int_-2147483649.74e]
+// CHECK:STDOUT:   %.loc12_11.3: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_-2147483649.74e]
+// CHECK:STDOUT:   %.loc12_11.4: %i32 = converted %int.snegate, %.loc12_11.3 [concrete = constants.%int_-2147483649.74e]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc12_11.4)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
 // CHECK:STDOUT: --- import_int_default_param_sucessful_call_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
@@ -858,7 +1638,89 @@ fn F() {
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @foo();
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- fail_int_ref_param_function_decl.carbon
+// CHECK:STDOUT: --- import_int_const_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
+// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = @F.%foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_const_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {} {}
+// CHECK:STDOUT:   %foo.ref: %foo.type = name_ref foo, %foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.1: %i32 = value_of_initializer %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_11.2: %i32 = converted %int_1, %.loc7_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc7_11.2)
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @foo();
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_todo_int_ref_param_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
@@ -943,7 +1805,92 @@ fn F() {
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- fail_int_pointer_param_function_decl.carbon
+// CHECK:STDOUT: --- fail_todo_int_const_ref_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %pattern_type.7ce: type = pattern_type %i32 [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = <error>
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_const_ref_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %a.patt: %pattern_type.7ce = binding_pattern a [concrete]
+// CHECK:STDOUT:     %.loc7_3.1: %pattern_type.7ce = var_pattern %a.patt [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a.var: ref %i32 = var a
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_3.2: init %i32 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   assign %a.var, %.loc7_3.2
+// CHECK:STDOUT:   %.loc7_11: type = splice_block %i32 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a: ref %i32 = bind_name a, %a.var
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %a.ref: ref %i32 = name_ref a, %a
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_todo_int_pointer_param_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
@@ -1030,7 +1977,94 @@ fn F() {
 // CHECK:STDOUT:   return
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- fail_import_unsupported_primitive_type_param_function_decl.carbon
+// CHECK:STDOUT: --- fail_todo_int_const_pointer_param_function_decl.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]
+// CHECK:STDOUT:   %F: %F.type = struct_value () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %Int.type: type = generic_class_type @Int [concrete]
+// CHECK:STDOUT:   %Int.generic: %Int.type = struct_value () [concrete]
+// CHECK:STDOUT:   %i32: type = class_type @Int, @Int(%int_32) [concrete]
+// CHECK:STDOUT:   %pattern_type.7ce: type = pattern_type %i32 [concrete]
+// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.cc7: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.cc7 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %Convert.type.1b6: type = fn_type @Convert.1, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To.c80: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Convert.type.0f9: type = fn_type @Convert.2, @impl.4f9(%To.c80) [symbolic]
+// CHECK:STDOUT:   %Convert.f06: %Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.type.035: type = fn_type @Convert.2, @impl.4f9(%int_32) [concrete]
+// CHECK:STDOUT:   %Convert.956: %Convert.type.035 = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.205 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.c75) [concrete]
+// CHECK:STDOUT:   %.9c3: type = fn_type_with_self_type %Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Convert.bound: <bound method> = bound_method %int_1.5b8, %Convert.956 [concrete]
+// CHECK:STDOUT:   %Convert.specific_fn: <specific function> = specific_function %Convert.956, @Convert.2(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT:   %ptr.235: type = ptr_type %i32 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
+// CHECK:STDOUT:     .Int = %Core.Int
+// CHECK:STDOUT:     .ImplicitAs = %Core.ImplicitAs
+// CHECK:STDOUT:     import Core//prelude
+// CHECK:STDOUT:     import Core//prelude/...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = <error>
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.Int: %Int.type = import_ref Core//prelude/types/int, Int, loaded [concrete = constants.%Int.generic]
+// CHECK:STDOUT:   %Core.ImplicitAs: %ImplicitAs.type.cc7 = import_ref Core//prelude/operators/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
+// CHECK:STDOUT:   %Core.import_ref.a5b: @impl.4f9.%Convert.type (%Convert.type.0f9) = import_ref Core//prelude/types/int, loc19_39, loaded [symbolic = @impl.4f9.%Convert (constants.%Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @impl.4f9 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .Core = imports.%Core
+// CHECK:STDOUT:     .Cpp = imports.%Cpp
+// CHECK:STDOUT:     .F = %F.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import = import Core
+// CHECK:STDOUT:   %Cpp.import_cpp = import_cpp {
+// CHECK:STDOUT:     import Cpp "int_const_pointer_param_function_decl.h"
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: fn @F() {
+// CHECK:STDOUT: !entry:
+// CHECK:STDOUT:   name_binding_decl {
+// CHECK:STDOUT:     %a.patt: %pattern_type.7ce = binding_pattern a [concrete]
+// CHECK:STDOUT:     %.loc7_3.1: %pattern_type.7ce = var_pattern %a.patt [concrete]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a.var: ref %i32 = var a
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.9c3 = impl_witness_access constants.%ImplicitAs.impl_witness.c75, element0 [concrete = constants.%Convert.956]
+// CHECK:STDOUT:   %bound_method.loc7_3.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Convert.2(constants.%int_32) [concrete = constants.%Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc7_3.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %int.convert_checked: init %i32 = call %bound_method.loc7_3.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc7_3.2: init %i32 = converted %int_1, %int.convert_checked [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   assign %a.var, %.loc7_3.2
+// CHECK:STDOUT:   %.loc7_11: type = splice_block %i32 [concrete = constants.%i32] {
+// CHECK:STDOUT:     %int_32: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
+// CHECK:STDOUT:     %i32: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %a: ref %i32 = bind_name a, %a.var
+// CHECK:STDOUT:   %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
+// CHECK:STDOUT:   %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
+// CHECK:STDOUT:   %a.ref: ref %i32 = name_ref a, %a
+// CHECK:STDOUT:   %addr: %ptr.235 = addr_of %a.ref
+// CHECK:STDOUT:   return
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: --- fail_todo_import_unsupported_primitive_type_param_function_decl.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
 // CHECK:STDOUT:   %F.type: type = fn_type @F [concrete]