diff --git a/toolchain/check/cpp_thunk.cpp b/toolchain/check/cpp_thunk.cpp
index 9f58efaf90cf..83581f55a8ad 100644
--- a/toolchain/check/cpp_thunk.cpp
+++ b/toolchain/check/cpp_thunk.cpp
@@ -53,12 +53,12 @@ static auto IsThunkRequiredForType(Context& context, SemIR::TypeId type_id)
         return true;
       }
 
-      if (!context.types().IsSignedInt(type_id)) {
+      auto int_info = context.types().TryGetIntTypeInfo(type_id);
+      if (!int_info || !int_info->bit_width.has_value()) {
         return true;
       }
 
-      llvm::APInt bit_width =
-          context.ints().Get(context.types().GetIntTypeInfo(type_id).bit_width);
+      llvm::APInt bit_width = context.ints().Get(int_info->bit_width);
       return bit_width != 32 && bit_width != 64;
     }
 
diff --git a/toolchain/check/import_cpp.cpp b/toolchain/check/import_cpp.cpp
index 0daede2be903..e66a76a69005 100644
--- a/toolchain/check/import_cpp.cpp
+++ b/toolchain/check/import_cpp.cpp
@@ -1062,7 +1062,7 @@ static auto MapBuiltinType(Context& context, SemIR::LocId loc_id,
           MakeIntType(context, context.ints().Add(width), is_signed);
       // Try to make sure signed integer of 32 or 64 bits are complete so we can
       // check against them when deciding whether we need to generate a thunk.
-      if (is_signed && (width == 32 || width == 64)) {
+      if (width == 32 || width == 64) {
         SemIR::TypeId type_id = type_expr.type_id;
         if (!context.types().IsComplete(type_id)) {
           TryToCompleteType(context, type_id, loc_id);
diff --git a/toolchain/check/testdata/interop/cpp/function/arithmetic_types_bridged.carbon b/toolchain/check/testdata/interop/cpp/function/arithmetic_types_bridged.carbon
index fbad1fb163e7..397f373e8d27 100644
--- a/toolchain/check/testdata/interop/cpp/function/arithmetic_types_bridged.carbon
+++ b/toolchain/check/testdata/interop/cpp/function/arithmetic_types_bridged.carbon
@@ -470,52 +470,6 @@ fn F() {
   //@dump-sem-ir-end
 }
 
-// ============================================================================
-// unsigned int param
-// ============================================================================
-
-// --- unsigned_int_param.h
-
-auto foo(unsigned int a) -> void;
-
-// --- import_unsigned_int_param.carbon
-
-library "[[@TEST_NAME]]";
-
-import Cpp library "unsigned_int_param.h";
-
-fn F() {
-  //@dump-sem-ir-begin
-  Cpp.foo(1);
-  //@dump-sem-ir-end
-}
-
-// --- fail_import_unsigned_int_param_overflow.carbon
-
-library "[[@TEST_NAME]]";
-
-import Cpp library "unsigned_int_param.h";
-
-fn F() {
-  Cpp.foo(0);
-
-  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon:[[@LINE+5]]:11: error: negative integer value -1 converted to unsigned type `u32` [NegativeIntInUnsignedType]
-  // CHECK:STDERR:   Cpp.foo(-1);
-  // CHECK:STDERR:           ^~
-  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon: note: initializing function parameter [InCallToFunctionParam]
-  // CHECK:STDERR:
-  Cpp.foo(-1);
-
-  Cpp.foo(0x0_FFFF_FFFF);
-
-  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon:[[@LINE+5]]:11: error: integer value 4294967296 too large for type `u32` [IntTooLargeForType]
-  // CHECK:STDERR:   Cpp.foo(0x1_0000_0000);
-  // CHECK:STDERR:           ^~~~~~~~~~~~~
-  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon: note: initializing function parameter [InCallToFunctionParam]
-  // CHECK:STDERR:
-  Cpp.foo(0x1_0000_0000);
-}
-
 // ============================================================================
 // _BitInt(24) param
 // ============================================================================
@@ -1766,79 +1720,6 @@ fn F() {
 // CHECK:STDOUT:   <elided>
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: --- import_unsigned_int_param.carbon
-// CHECK:STDOUT:
-// CHECK:STDOUT: constants {
-// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
-// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
-// CHECK:STDOUT:   %u32: type = class_type @UInt, @UInt(%int_32) [concrete]
-// CHECK:STDOUT:   %foo.type: type = fn_type @foo [concrete]
-// CHECK:STDOUT:   %foo: %foo.type = struct_value () [concrete]
-// CHECK:STDOUT:   %ptr.6fd: type = ptr_type %u32 [concrete]
-// CHECK:STDOUT:   %foo__carbon_thunk.type: type = fn_type @foo__carbon_thunk [concrete]
-// CHECK:STDOUT:   %foo__carbon_thunk: %foo__carbon_thunk.type = struct_value () [concrete]
-// CHECK:STDOUT:   %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
-// CHECK:STDOUT:   %ImplicitAs.type.9b4: type = facet_type <@ImplicitAs, @ImplicitAs(%u32)> [concrete]
-// CHECK:STDOUT:   %ImplicitAs.Convert.type.92a: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%u32) [concrete]
-// CHECK:STDOUT:   %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.30e: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.d1a: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.30e = struct_value () [symbolic]
-// CHECK:STDOUT:   %ImplicitAs.impl_witness.ac5: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.bb8, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.feb: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.319: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.feb = struct_value () [concrete]
-// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.9b4 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.ac5) [concrete]
-// CHECK:STDOUT:   %.bd1: type = fn_type_with_self_type %ImplicitAs.Convert.type.92a, %ImplicitAs.facet [concrete]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.319 [concrete]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.319, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
-// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
-// CHECK:STDOUT:   %int_1.c1d: %u32 = int_value 1 [concrete]
-// CHECK:STDOUT:   %UInt.as.Destroy.impl.Op.type.308: type = fn_type @UInt.as.Destroy.impl.Op, @UInt.as.Destroy.impl(%int_32) [concrete]
-// CHECK:STDOUT:   %UInt.as.Destroy.impl.Op.e70: %UInt.as.Destroy.impl.Op.type.308 = struct_value () [concrete]
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: imports {
-// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
-// CHECK:STDOUT:     .foo = %foo.decl
-// CHECK:STDOUT:     import Cpp//...
-// CHECK:STDOUT:   }
-// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
-// CHECK:STDOUT:     <elided>
-// CHECK:STDOUT:   } {
-// CHECK:STDOUT:     <elided>
-// CHECK:STDOUT:   }
-// CHECK:STDOUT:   %foo__carbon_thunk.decl: %foo__carbon_thunk.type = fn_decl @foo__carbon_thunk [concrete = constants.%foo__carbon_thunk] {
-// CHECK:STDOUT:     <elided>
-// CHECK:STDOUT:   } {
-// CHECK:STDOUT:     <elided>
-// CHECK:STDOUT:   }
-// CHECK:STDOUT:   %Core.import_ref.c3d: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.30e) = import_ref Core//prelude/parts/uint, loc16_40, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.d1a)]
-// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.bb8 = impl_witness_table (%Core.import_ref.c3d), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
-// 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:   %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
-// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
-// CHECK:STDOUT:   %impl.elem0: %.bd1 = impl_witness_access constants.%ImplicitAs.impl_witness.ac5, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.319]
-// CHECK:STDOUT:   %bound_method.loc8_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
-// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
-// CHECK:STDOUT:   %bound_method.loc8_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
-// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.call: init %u32 = call %bound_method.loc8_11.2(%int_1) [concrete = constants.%int_1.c1d]
-// CHECK:STDOUT:   %.loc8_11.1: %u32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call [concrete = constants.%int_1.c1d]
-// CHECK:STDOUT:   %.loc8_11.2: %u32 = converted %int_1, %.loc8_11.1 [concrete = constants.%int_1.c1d]
-// CHECK:STDOUT:   %.loc8_11.3: ref %u32 = temporary_storage
-// CHECK:STDOUT:   %.loc8_11.4: ref %u32 = temporary %.loc8_11.3, %.loc8_11.2
-// CHECK:STDOUT:   %addr.loc8_12: %ptr.6fd = addr_of %.loc8_11.4
-// CHECK:STDOUT:   %foo__carbon_thunk.call: init %empty_tuple.type = call imports.%foo__carbon_thunk.decl(%addr.loc8_12)
-// CHECK:STDOUT:   %UInt.as.Destroy.impl.Op.bound: <bound method> = bound_method %.loc8_11.3, constants.%UInt.as.Destroy.impl.Op.e70
-// CHECK:STDOUT:   <elided>
-// CHECK:STDOUT:   %bound_method.loc8_11.3: <bound method> = bound_method %.loc8_11.3, %UInt.as.Destroy.impl.Op.specific_fn
-// CHECK:STDOUT:   %addr.loc8_11: %ptr.6fd = addr_of %.loc8_11.3
-// CHECK:STDOUT:   %UInt.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method.loc8_11.3(%addr.loc8_11)
-// CHECK:STDOUT:   <elided>
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
 // CHECK:STDOUT: --- fail_todo_import_bit_int_24_param.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
diff --git a/toolchain/check/testdata/interop/cpp/function/arithmetic_types_direct.carbon b/toolchain/check/testdata/interop/cpp/function/arithmetic_types_direct.carbon
index cfd1570a3997..95535ece5349 100644
--- a/toolchain/check/testdata/interop/cpp/function/arithmetic_types_direct.carbon
+++ b/toolchain/check/testdata/interop/cpp/function/arithmetic_types_direct.carbon
@@ -29,7 +29,9 @@ library "[[@TEST_NAME]]";
 import Cpp library "int_param.h";
 
 fn F() {
+  //@dump-sem-ir-begin
   Cpp.foo(1);
+  //@dump-sem-ir-end
 }
 
 // --- import_int_param_max.carbon
@@ -126,6 +128,52 @@ fn F() {
   //@dump-sem-ir-end
 }
 
+// ============================================================================
+// unsigned int param
+// ============================================================================
+
+// --- unsigned_int_param.h
+
+auto foo(unsigned int a) -> void;
+
+// --- import_unsigned_int_param.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "unsigned_int_param.h";
+
+fn F() {
+  //@dump-sem-ir-begin
+  Cpp.foo(1);
+  //@dump-sem-ir-end
+}
+
+// --- fail_import_unsigned_int_param_overflow.carbon
+
+library "[[@TEST_NAME]]";
+
+import Cpp library "unsigned_int_param.h";
+
+fn F() {
+  Cpp.foo(0);
+
+  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon:[[@LINE+5]]:11: error: negative integer value -1 converted to unsigned type `u32` [NegativeIntInUnsignedType]
+  // CHECK:STDERR:   Cpp.foo(-1);
+  // CHECK:STDERR:           ^~
+  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon: note: initializing function parameter [InCallToFunctionParam]
+  // CHECK:STDERR:
+  Cpp.foo(-1);
+
+  Cpp.foo(0x0_FFFF_FFFF);
+
+  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon:[[@LINE+5]]:11: error: integer value 4294967296 too large for type `u32` [IntTooLargeForType]
+  // CHECK:STDERR:   Cpp.foo(0x1_0000_0000);
+  // CHECK:STDERR:           ^~~~~~~~~~~~~
+  // CHECK:STDERR: fail_import_unsigned_int_param_overflow.carbon: note: initializing function parameter [InCallToFunctionParam]
+  // CHECK:STDERR:
+  Cpp.foo(0x1_0000_0000);
+}
+
 // ============================================================================
 // typedef for int param
 // ============================================================================
@@ -419,6 +467,61 @@ fn F() {
   //@dump-sem-ir-end
 }
 
+// CHECK:STDOUT: --- import_int_param.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [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.205: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
+// CHECK:STDOUT:   %ImplicitAs.Convert.type.1b6: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%i32) [concrete]
+// CHECK:STDOUT:   %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.f06: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9 = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.c75: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.a2f, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.035: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.956: %Core.IntLiteral.as.ImplicitAs.impl.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 %ImplicitAs.Convert.type.1b6, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.956 [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.956, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.5d2: %i32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = %foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
+// CHECK:STDOUT:     <elided>
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     <elided>
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import_ref.a5b: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.0f9) = import_ref Core//prelude/parts/int, loc16_39, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.f06)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.a2f = impl_witness_table (%Core.import_ref.a5b), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
+// 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:   %foo.ref: %foo.type = name_ref foo, imports.%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.%Core.IntLiteral.as.ImplicitAs.impl.Convert.956]
+// CHECK:STDOUT:   %bound_method.loc8_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc8_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.call: init %i32 = call %bound_method.loc8_11.2(%int_1) [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc8_11.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %.loc8_11.2: %i32 = converted %int_1, %.loc8_11.1 [concrete = constants.%int_1.5d2]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc8_11.2)
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: --- import_int_param_max.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {
@@ -656,6 +759,61 @@ fn F() {
 // CHECK:STDOUT:   <elided>
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
+// CHECK:STDOUT: --- import_unsigned_int_param.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %empty_tuple.type: type = tuple_type () [concrete]
+// CHECK:STDOUT:   %int_32: Core.IntLiteral = int_value 32 [concrete]
+// CHECK:STDOUT:   %u32: type = class_type @UInt, @UInt(%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.9b4: type = facet_type <@ImplicitAs, @ImplicitAs(%u32)> [concrete]
+// CHECK:STDOUT:   %ImplicitAs.Convert.type.92a: type = fn_type @ImplicitAs.Convert, @ImplicitAs(%u32) [concrete]
+// CHECK:STDOUT:   %To: Core.IntLiteral = bind_symbolic_name To, 0 [symbolic]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.30e: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.d1a: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.30e = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness.ac5: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.bb8, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.feb: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.319: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.feb = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.facet: %ImplicitAs.type.9b4 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.ac5) [concrete]
+// CHECK:STDOUT:   %.bd1: type = fn_type_with_self_type %ImplicitAs.Convert.type.92a, %ImplicitAs.facet [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.319 [concrete]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.319, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
+// CHECK:STDOUT:   %bound_method: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
+// CHECK:STDOUT:   %int_1.c1d: %u32 = int_value 1 [concrete]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: imports {
+// CHECK:STDOUT:   %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
+// CHECK:STDOUT:     .foo = %foo.decl
+// CHECK:STDOUT:     import Cpp//...
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %foo.decl: %foo.type = fn_decl @foo [concrete = constants.%foo] {
+// CHECK:STDOUT:     <elided>
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     <elided>
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %Core.import_ref.c3d: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.30e) = import_ref Core//prelude/parts/uint, loc16_40, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.d1a)]
+// CHECK:STDOUT:   %ImplicitAs.impl_witness_table.bb8 = impl_witness_table (%Core.import_ref.c3d), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
+// 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:   %foo.ref: %foo.type = name_ref foo, imports.%foo.decl [concrete = constants.%foo]
+// CHECK:STDOUT:   %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
+// CHECK:STDOUT:   %impl.elem0: %.bd1 = impl_witness_access constants.%ImplicitAs.impl_witness.ac5, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.319]
+// CHECK:STDOUT:   %bound_method.loc8_11.1: <bound method> = bound_method %int_1, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
+// CHECK:STDOUT:   %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
+// CHECK:STDOUT:   %bound_method.loc8_11.2: <bound method> = bound_method %int_1, %specific_fn [concrete = constants.%bound_method]
+// CHECK:STDOUT:   %Core.IntLiteral.as.ImplicitAs.impl.Convert.call: init %u32 = call %bound_method.loc8_11.2(%int_1) [concrete = constants.%int_1.c1d]
+// CHECK:STDOUT:   %.loc8_11.1: %u32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call [concrete = constants.%int_1.c1d]
+// CHECK:STDOUT:   %.loc8_11.2: %u32 = converted %int_1, %.loc8_11.1 [concrete = constants.%int_1.c1d]
+// CHECK:STDOUT:   %foo.call: init %empty_tuple.type = call %foo.ref(%.loc8_11.2)
+// CHECK:STDOUT:   <elided>
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
 // CHECK:STDOUT: --- import_int32_t_param.carbon
 // CHECK:STDOUT:
 // CHECK:STDOUT: constants {