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fdb188ccfd033ee9bbeff6807efdf0863a9318cf
carbon-lang/toolchain/check/testdata/impl/impl_as.carbon
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Burak EmirBurak Emirjonmeow
 fdb188ccfd Implement unused pattern bindings, continued (#6518) 
Implementation of unused pattern bindings #2022, continued.

Whereas previous PR #6460 took care of parsing, and PR #6479 prepared
the stage by using _ in some test cases, this PR has the the actual
implementation, using a simple dataflow analysis.

---------

Co-authored-by: Burak Emir <bqe@google.com>
Co-authored-by: jonmeow <jperkins@google.com>
2026-02-19 23:33:36 +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/destroy.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/impl_as.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/impl_as.carbon
interface Simple {
fn F();
}
class C {
impl as Simple {
fn F() {
// C is a complete type here.
var unused c: C = {};
}
}
}
// CHECK:STDOUT: --- impl_as.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Simple.type: type = facet_type <@Simple> [concrete]
// CHECK:STDOUT: %Self.af2: %Simple.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Simple.WithSelf.F.type.75b: type = fn_type @Simple.WithSelf.F, @Simple(%Self.af2) [symbolic]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Simple.WithSelf.F.58c: %Simple.WithSelf.F.type.75b = struct_value () [symbolic]
// CHECK:STDOUT: %Simple.assoc_type: type = assoc_entity_type @Simple [concrete]
// CHECK:STDOUT: %assoc0.db6: %Simple.assoc_type = assoc_entity element0, @Simple.%Simple.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %Simple.impl_witness: <witness> = impl_witness @C.as.Simple.impl.%Simple.impl_witness_table [concrete]
// CHECK:STDOUT: %C.as.Simple.impl.F.type: type = fn_type @C.as.Simple.impl.F [concrete]
// CHECK:STDOUT: %C.as.Simple.impl.F: %C.as.Simple.impl.F.type = struct_value () [concrete]
// CHECK:STDOUT: %Simple.facet: %Simple.type = facet_value %C, (%Simple.impl_witness) [concrete]
// CHECK:STDOUT: %Simple.WithSelf.F.type.839: type = fn_type @Simple.WithSelf.F, @Simple(%Simple.facet) [concrete]
// CHECK:STDOUT: %Simple.WithSelf.F.79e: %Simple.WithSelf.F.type.839 = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %pattern_type.7c7: type = pattern_type %C [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %C.val: %C = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %DestroyOp.type: type = fn_type @DestroyOp [concrete]
// CHECK:STDOUT: %DestroyOp: %DestroyOp.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Destroy = %Core.Destroy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Simple = %Simple.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Simple.decl: type = interface_decl @Simple [concrete = constants.%Simple.type] {} {}
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Simple {
// CHECK:STDOUT: %Self.loc15: %Simple.type = symbolic_binding Self, 0 [symbolic = constants.%Self.af2]
// CHECK:STDOUT: interface_with_self_decl @Simple [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %Simple.WithSelf.F.decl: @Simple.%Simple.WithSelf.F.type (%Simple.WithSelf.F.type.75b) = fn_decl @Simple.WithSelf.F [symbolic = @Simple.%Simple.WithSelf.F (constants.%Simple.WithSelf.F.58c)] {} {}
// CHECK:STDOUT: %assoc0: %Simple.assoc_type = assoc_entity element0, %Simple.WithSelf.F.decl [concrete = constants.%assoc0.db6]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc15
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%Simple.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.Simple.impl: %Self.ref as %Simple.ref {
// CHECK:STDOUT: %C.as.Simple.impl.F.decl: %C.as.Simple.impl.F.type = fn_decl @C.as.Simple.impl.F [concrete = constants.%C.as.Simple.impl.F] {} {}
// CHECK:STDOUT: %Simple.impl_witness_table = impl_witness_table (%C.as.Simple.impl.F.decl), @C.as.Simple.impl [concrete]
// CHECK:STDOUT: %Simple.impl_witness: <witness> = impl_witness %Simple.impl_witness_table [concrete = constants.%Simple.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %C.as.Simple.impl.F.decl
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: witness = %Simple.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: impl_decl @C.as.Simple.impl [concrete] {} {
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
// CHECK:STDOUT: %Simple.ref: type = name_ref Simple, file.%Simple.decl [concrete = constants.%Simple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: .Simple = <poisoned>
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Simple.WithSelf.F(@Simple.%Self.loc15: %Simple.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.Simple.impl.F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.7c7 = ref_binding_pattern c [concrete]
// CHECK:STDOUT: %c.var_patt: %pattern_type.7c7 = var_pattern %c.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.var: ref %C = var %c.var_patt
// CHECK:STDOUT: %.loc23_26.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc23_26.2: init %C to %c.var = class_init () [concrete = constants.%C.val]
// CHECK:STDOUT: %.loc23_7: init %C = converted %.loc23_26.1, %.loc23_26.2 [concrete = constants.%C.val]
// CHECK:STDOUT: assign %c.var, %.loc23_7
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %c: ref %C = ref_binding c, %c.var
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %c.var, constants.%DestroyOp
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%c.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @DestroyOp(%self.param: ref %C) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Simple(constants.%Self.af2) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self.loc16 => constants.%Self.af2
// CHECK:STDOUT: %Simple.WithSelf.F.type => constants.%Simple.WithSelf.F.type.75b
// CHECK:STDOUT: %Simple.WithSelf.F => constants.%Simple.WithSelf.F.58c
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Simple.WithSelf.F(constants.%Self.af2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Simple(constants.%Simple.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self.loc16 => constants.%Simple.facet
// CHECK:STDOUT: %Simple.WithSelf.F.type => constants.%Simple.WithSelf.F.type.839
// CHECK:STDOUT: %Simple.WithSelf.F => constants.%Simple.WithSelf.F.79e
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Simple.WithSelf.F(constants.%Simple.facet) {}
// CHECK:STDOUT:
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