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carbon-lang/toolchain/check/testdata/interop/cpp/function/decayed_param.carbon
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Dana Jansens fe020ee08b Make FacetAccessType evaluate to SymbolicBindingType for type-of a BindSymbolicName (#6115) 
The SymbolicBindingType refers to the type value that will be
substituted in for the BindSymbolicName, but holds onto the EntityNameId
from the BindSymbolicName instead of (or in addition to, for now) the
instruction.

The EntityNameId will be used to look in the ScopeStack to find the
witnesses either from the BindSymbolicName instruction, or other
instructions that specify `impls` constraints against the EntityName.

This will allow us to have the `T` in `I(T)` resolve to a `.Self`
reference in the type so that we get type equality with the binding's
type: `T:! I(.Self)`.
2025-10-06 18:56:43 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/function/decayed_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/function/decayed_param.carbon
// --- params.h
void TakesArray(int arr[42]);
void TakesFunction(int f(int));
int Function(int);
// --- fail_todo_call_params.carbon
library "[[@TEST_NAME]]";
import Cpp library "params.h";
fn G(n: i32) -> i32;
fn F() {
//@dump-sem-ir-begin
var n: array(i32, 42);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:3: error: semantics TODO: `Unsupported: parameter type: int *` [SemanticsTodo]
// CHECK:STDERR: Cpp.TakesArray(&n[0]);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesArray(&n[0]);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:18: error: member name `nullptr` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.TakesArray(Cpp.nullptr);
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesArray(Cpp.nullptr);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:21: error: call argument of type `<type of G>` is not supported [CppCallArgTypeNotSupported]
// CHECK:STDERR: Cpp.TakesFunction(G);
// CHECK:STDERR: ^
// CHECK:STDERR:
Cpp.TakesFunction(G);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:21: error: call argument of type `<type of Cpp.Function>` is not supported [CppCallArgTypeNotSupported]
// CHECK:STDERR: Cpp.TakesFunction(Cpp.Function);
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesFunction(Cpp.Function);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+8]]:26: error: no matching function for call to 'TakesFunction' [CppInteropParseError]
// CHECK:STDERR: 43 | Cpp.TakesFunction(&n[0]);
// CHECK:STDERR: | ^
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE-34]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./params.h:3:6: note: candidate function not viable: no known conversion from 'int * _Nonnull' to 'int (*)(int)' for 1st argument [CppInteropParseNote]
// CHECK:STDERR: 3 | void TakesFunction(int f(int));
// CHECK:STDERR: | ^ ~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesFunction(&n[0]);
// CHECK:STDERR: fail_todo_call_params.carbon:[[@LINE+4]]:21: error: member name `nullptr` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: Cpp.TakesFunction(Cpp.nullptr);
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
Cpp.TakesFunction(Cpp.nullptr);
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- fail_todo_call_params.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %int_42: Core.IntLiteral = int_value 42 [concrete]
// CHECK:STDOUT: %array_type: type = array_type %int_42, %i32 [concrete]
// CHECK:STDOUT: %ptr.830: type = ptr_type %array_type [concrete]
// CHECK:STDOUT: %pattern_type.b6e: type = pattern_type %array_type [concrete]
// CHECK:STDOUT: %TakesArray.cpp_overload_set.type: type = cpp_overload_set_type @TakesArray.cpp_overload_set [concrete]
// CHECK:STDOUT: %TakesArray.cpp_overload_set.value: %TakesArray.cpp_overload_set.type = cpp_overload_set_value @TakesArray.cpp_overload_set [concrete]
// CHECK:STDOUT: %int_0.5c6: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %ImplicitAs.type.d14: 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.340: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.1c0: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.340 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.204: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.9e9, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.584: 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.0f0: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.584 = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.d14 = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.204) [concrete]
// CHECK:STDOUT: %.1df: 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_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %int_0.5c6, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_0.6a9: %i32 = int_value 0 [concrete]
// CHECK:STDOUT: %ptr.235: type = ptr_type %i32 [concrete]
// CHECK:STDOUT: %TakesFunction.cpp_overload_set.type: type = cpp_overload_set_type @TakesFunction.cpp_overload_set [concrete]
// CHECK:STDOUT: %TakesFunction.cpp_overload_set.value: %TakesFunction.cpp_overload_set.type = cpp_overload_set_value @TakesFunction.cpp_overload_set [concrete]
// CHECK:STDOUT: %Function.cpp_overload_set.type: type = cpp_overload_set_type @Function.cpp_overload_set [concrete]
// CHECK:STDOUT: %Function.cpp_overload_set.value: %Function.cpp_overload_set.type = cpp_overload_set_value @Function.cpp_overload_set [concrete]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls <CanDestroy>> [concrete]
// CHECK:STDOUT: %facet_value: %type_where = facet_value %array_type, () [concrete]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.type.4f7: type = fn_type @DestroyT.binding.as_type.as.Destroy.impl.Op, @DestroyT.binding.as_type.as.Destroy.impl(%facet_value) [concrete]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.ce8: %DestroyT.binding.as_type.as.Destroy.impl.Op.type.4f7 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .TakesArray = %TakesArray.cpp_overload_set.value
// CHECK:STDOUT: .nullptr = <poisoned>
// CHECK:STDOUT: .TakesFunction = %TakesFunction.cpp_overload_set.value
// CHECK:STDOUT: .Function = %Function.cpp_overload_set.value
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %TakesArray.cpp_overload_set.value: %TakesArray.cpp_overload_set.type = cpp_overload_set_value @TakesArray.cpp_overload_set [concrete = constants.%TakesArray.cpp_overload_set.value]
// CHECK:STDOUT: %Core.import_ref.ee7: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.340) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.1c0)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.9e9 = impl_witness_table (%Core.import_ref.ee7), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: %TakesFunction.cpp_overload_set.value: %TakesFunction.cpp_overload_set.type = cpp_overload_set_value @TakesFunction.cpp_overload_set [concrete = constants.%TakesFunction.cpp_overload_set.value]
// CHECK:STDOUT: %Function.cpp_overload_set.value: %Function.cpp_overload_set.type = cpp_overload_set_value @Function.cpp_overload_set [concrete = constants.%Function.cpp_overload_set.value]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %n.patt: %pattern_type.b6e = binding_pattern n [concrete]
// CHECK:STDOUT: %n.var_patt: %pattern_type.b6e = var_pattern %n.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n.var: ref %array_type = var %n.var_patt
// CHECK:STDOUT: %.loc10_23: type = splice_block %array_type [concrete = constants.%array_type] {
// CHECK:STDOUT: %int_32.loc10: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc10: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %int_42: Core.IntLiteral = int_value 42 [concrete = constants.%int_42]
// CHECK:STDOUT: %array_type: type = array_type %int_42, %i32.loc10 [concrete = constants.%array_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n: ref %array_type = bind_name n, %n.var
// CHECK:STDOUT: %Cpp.ref.loc15: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesArray.ref.loc15: %TakesArray.cpp_overload_set.type = name_ref TakesArray, imports.%TakesArray.cpp_overload_set.value [concrete = constants.%TakesArray.cpp_overload_set.value]
// CHECK:STDOUT: %n.ref.loc15: ref %array_type = name_ref n, %n
// CHECK:STDOUT: %int_0.loc15: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %int_32.loc15: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc15: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0.loc15: %.1df = impl_witness_access constants.%ImplicitAs.impl_witness.204, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0]
// CHECK:STDOUT: %bound_method.loc15_21.1: <bound method> = bound_method %int_0.loc15, %impl.elem0.loc15 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn.loc15: <specific function> = specific_function %impl.elem0.loc15, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc15_21.2: <bound method> = bound_method %int_0.loc15, %specific_fn.loc15 [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc15: init %i32 = call %bound_method.loc15_21.2(%int_0.loc15) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15_21.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc15 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15_21.2: %i32 = converted %int_0.loc15, %.loc15_21.1 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc15_22: ref %i32 = array_index %n.ref.loc15, %.loc15_21.2
// CHECK:STDOUT: %addr.loc15: %ptr.235 = addr_of %.loc15_22
// CHECK:STDOUT: %Cpp.ref.loc21_3: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesArray.ref.loc21: %TakesArray.cpp_overload_set.type = name_ref TakesArray, imports.%TakesArray.cpp_overload_set.value [concrete = constants.%TakesArray.cpp_overload_set.value]
// CHECK:STDOUT: %Cpp.ref.loc21_18: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %nullptr.ref.loc21: <error> = name_ref nullptr, <error> [concrete = <error>]
// CHECK:STDOUT: %Cpp.ref.loc27: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc27: %TakesFunction.cpp_overload_set.type = name_ref TakesFunction, imports.%TakesFunction.cpp_overload_set.value [concrete = constants.%TakesFunction.cpp_overload_set.value]
// CHECK:STDOUT: %G.ref: %G.type = name_ref G, file.%G.decl [concrete = constants.%G]
// CHECK:STDOUT: %Cpp.ref.loc33_3: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc33: %TakesFunction.cpp_overload_set.type = name_ref TakesFunction, imports.%TakesFunction.cpp_overload_set.value [concrete = constants.%TakesFunction.cpp_overload_set.value]
// CHECK:STDOUT: %Cpp.ref.loc33_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Function.ref: %Function.cpp_overload_set.type = name_ref Function, imports.%Function.cpp_overload_set.value [concrete = constants.%Function.cpp_overload_set.value]
// CHECK:STDOUT: %Cpp.ref.loc43: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc43: %TakesFunction.cpp_overload_set.type = name_ref TakesFunction, imports.%TakesFunction.cpp_overload_set.value [concrete = constants.%TakesFunction.cpp_overload_set.value]
// CHECK:STDOUT: %n.ref.loc43: ref %array_type = name_ref n, %n
// CHECK:STDOUT: %int_0.loc43: Core.IntLiteral = int_value 0 [concrete = constants.%int_0.5c6]
// CHECK:STDOUT: %int_32.loc43: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc43: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %impl.elem0.loc43: %.1df = impl_witness_access constants.%ImplicitAs.impl_witness.204, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0f0]
// CHECK:STDOUT: %bound_method.loc43_24.1: <bound method> = bound_method %int_0.loc43, %impl.elem0.loc43 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn.loc43: <specific function> = specific_function %impl.elem0.loc43, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc43_24.2: <bound method> = bound_method %int_0.loc43, %specific_fn.loc43 [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc43: init %i32 = call %bound_method.loc43_24.2(%int_0.loc43) [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc43_24.1: %i32 = value_of_initializer %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc43 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc43_24.2: %i32 = converted %int_0.loc43, %.loc43_24.1 [concrete = constants.%int_0.6a9]
// CHECK:STDOUT: %.loc43_25: ref %i32 = array_index %n.ref.loc43, %.loc43_24.2
// CHECK:STDOUT: %addr.loc43: %ptr.235 = addr_of %.loc43_25
// CHECK:STDOUT: %Cpp.ref.loc49_3: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %TakesFunction.ref.loc49: %TakesFunction.cpp_overload_set.type = name_ref TakesFunction, imports.%TakesFunction.cpp_overload_set.value [concrete = constants.%TakesFunction.cpp_overload_set.value]
// CHECK:STDOUT: %Cpp.ref.loc49_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %nullptr.ref.loc49: <error> = name_ref nullptr, <error> [concrete = <error>]
// CHECK:STDOUT: %facet_value: %type_where = facet_value constants.%array_type, () [concrete = constants.%facet_value]
// CHECK:STDOUT: %.loc10_3: %type_where = converted constants.%array_type, %facet_value [concrete = constants.%facet_value]
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.bound: <bound method> = bound_method %n.var, constants.%DestroyT.binding.as_type.as.Destroy.impl.Op.ce8
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %bound_method.loc10: <bound method> = bound_method %n.var, %DestroyT.binding.as_type.as.Destroy.impl.Op.specific_fn
// CHECK:STDOUT: %addr.loc10: %ptr.830 = addr_of %n.var
// CHECK:STDOUT: %DestroyT.binding.as_type.as.Destroy.impl.Op.call: init %empty_tuple.type = call %bound_method.loc10(%addr.loc10)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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