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carbon-lang/toolchain/check/testdata/function/declaration/pattern_in_signature.carbon
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Richard Smith e69c3fd978 Support list initialization of C++ classes that is performed via a constructor call. (#6660) 
The general strategy here is to import the constructor with a signature
that directly matches the argument. The intent is that the imported
function will eventually be usable directly as the `ImplicitAs.Convert`
function in a generated `impl`.

For initialization from a tuple, for example `(1, 2)`, we import the
selected constructor with a signature that takes a tuple pattern:

  `fn Class.Class((a: i32, b: i32)) -> Class;`

In order to support that, this PR also adds support in general for tuple
patterns in function signatures. It turns out the implementation was
already very close to allowing this.

Assisted-by: Gemini 3 Pro via Antigravity
2026-01-27 22:04:21 +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/none.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/function/declaration/pattern_in_signature.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/declaration/pattern_in_signature.carbon
//@dump-sem-ir-begin
fn F((a: {}, b: {}), c: {}) {}
//@dump-sem-ir-end
//@dump-sem-ir-begin
fn CallF(ab: ({}, {}), c: {}) {
F(ab, c);
}
//@dump-sem-ir-end
// CHECK:STDOUT: --- pattern_in_signature.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %pattern_type.a96: type = pattern_type %empty_struct_type [concrete]
// CHECK:STDOUT: %tuple.type.b6b: type = tuple_type (%empty_struct_type, %empty_struct_type) [concrete]
// CHECK:STDOUT: %pattern_type.de4: type = pattern_type %tuple.type.b6b [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %tuple: %tuple.type.b6b = tuple_value (%empty_struct, %empty_struct) [concrete]
// CHECK:STDOUT: %CallF.type: type = fn_type @CallF [concrete]
// CHECK:STDOUT: %CallF: %CallF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %a.patt: %pattern_type.a96 = value_binding_pattern a [concrete]
// CHECK:STDOUT: %a.param_patt: %pattern_type.a96 = value_param_pattern %a.patt, call_param0 [concrete]
// CHECK:STDOUT: %b.patt: %pattern_type.a96 = value_binding_pattern b [concrete]
// CHECK:STDOUT: %b.param_patt: %pattern_type.a96 = value_param_pattern %b.patt, call_param1 [concrete]
// CHECK:STDOUT: %.loc14_19: %pattern_type.de4 = tuple_pattern (%a.param_patt, %b.param_patt) [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.a96 = value_binding_pattern c [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type.a96 = value_param_pattern %c.patt, call_param2 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %a.param: %empty_struct_type = value_param call_param0
// CHECK:STDOUT: %.loc14_11.1: type = splice_block %.loc14_11.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_11.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_11.3: type = converted %.loc14_11.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %empty_struct_type = value_binding a, %a.param
// CHECK:STDOUT: %b.param: %empty_struct_type = value_param call_param1
// CHECK:STDOUT: %.loc14_18.1: type = splice_block %.loc14_18.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_18.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_18.3: type = converted %.loc14_18.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %empty_struct_type = value_binding b, %b.param
// CHECK:STDOUT: %c.param: %empty_struct_type = value_param call_param2
// CHECK:STDOUT: %.loc14_26.1: type = splice_block %.loc14_26.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_26.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_26.3: type = converted %.loc14_26.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: %empty_struct_type = value_binding c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %CallF.decl: %CallF.type = fn_decl @CallF [concrete = constants.%CallF] {
// CHECK:STDOUT: %ab.patt: %pattern_type.de4 = value_binding_pattern ab [concrete]
// CHECK:STDOUT: %ab.param_patt: %pattern_type.de4 = value_param_pattern %ab.patt, call_param0 [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.a96 = value_binding_pattern c [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type.a96 = value_param_pattern %c.patt, call_param1 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %ab.param: %tuple.type.b6b = value_param call_param0
// CHECK:STDOUT: %.loc18_21.1: type = splice_block %.loc18_21.5 [concrete = constants.%tuple.type.b6b] {
// CHECK:STDOUT: %.loc18_16: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc18_20: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc18_21.2: %tuple.type.b6b = tuple_literal (%.loc18_16, %.loc18_20) [concrete = constants.%tuple]
// CHECK:STDOUT: %.loc18_21.3: type = converted constants.%empty_struct, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc18_21.4: type = converted constants.%empty_struct, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc18_21.5: type = converted %.loc18_21.2, constants.%tuple.type.b6b [concrete = constants.%tuple.type.b6b]
// CHECK:STDOUT: }
// CHECK:STDOUT: %ab: %tuple.type.b6b = value_binding ab, %ab.param
// CHECK:STDOUT: %c.param: %empty_struct_type = value_param call_param1
// CHECK:STDOUT: %.loc18_28.1: type = splice_block %.loc18_28.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc18_28.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc18_28.3: type = converted %.loc18_28.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: %empty_struct_type = value_binding c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%a.param: %empty_struct_type, %b.param: %empty_struct_type, %c.param: %empty_struct_type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CallF(%ab.param: %tuple.type.b6b, %c.param: %empty_struct_type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %ab.ref: %tuple.type.b6b = name_ref ab, %ab
// CHECK:STDOUT: %c.ref: %empty_struct_type = name_ref c, %c
// CHECK:STDOUT: %tuple.elem0: %empty_struct_type = tuple_access %ab.ref, element0
// CHECK:STDOUT: %tuple.elem1: %empty_struct_type = tuple_access %ab.ref, element1
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.ref(%tuple.elem0, %tuple.elem1, %c.ref)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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