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carbon-lang/toolchain/check/testdata/var/fail_duplicate_decl.carbon
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Christopher Di Bella f7cd39428e Add Destroy.SubobjectDestroy as a temporary replacement for Destroy.Op (#7773) 
This change partially implements [PR #7362], which revises how objects
are destroyed. It is a partial implementation for two reasons:

1. This change moves `Destroy.Op`'s current behaviour into
`Destroy.SubobjectDestroy`, but it doesn't add support for objects with
non-trivial destruction.
2. `Destroy.SubobjectDestroy` is a workaround for `require impls
SubobjectDestroy`. We aren't able to use the latter until the dependents
add their requirements' implementations to their own witness tables.

[PR #7362]: https://github.com/carbon-language/carbon-lang/pulls/7362
2026-09-24 00:06:28 +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/var/fail_duplicate_decl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/var/fail_duplicate_decl.carbon
// --- fail_basic.carbon
fn Main() {
var unused x: () = ();
// CHECK:STDERR: fail_basic.carbon:[[@LINE+7]]:14: error: duplicate name `x` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: var unused x: () = ();
// CHECK:STDERR: ^
// CHECK:STDERR: fail_basic.carbon:[[@LINE-4]]:14: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: var unused x: () = ();
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
var unused x: () = ();
}
// CHECK:STDOUT: --- fail_basic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Main.type: type = fn_type @Main [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Main: %Main.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %pattern_type.cb1: type = pattern_type %empty_tuple.type [concrete]
// CHECK:STDOUT: %x.patt.06838d.1: %pattern_type.cb1 = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt.28d573.1: %pattern_type.cb1 = var_pattern %x.patt.06838d.1 [concrete]
// CHECK:STDOUT: %x.patt.06838d.2: %pattern_type.cb1 = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt.28d573.2: %pattern_type.cb1 = var_pattern %x.patt.06838d.2 [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %self.param_patt.65a: %pattern_type.cb1 = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.df1: %pattern_type.cb1 = wrapper_binding_pattern self, %self.param_patt.65a [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.type.dfc: type = fn_type @Destroy.WithSelf.SubobjectDestroy.loc11 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.d01: %Destroy.WithSelf.SubobjectDestroy.type.dfc = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef0: type = fn_type @Destroy.WithSelf.Op.loc11 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403: %Destroy.WithSelf.Op.type.ef0 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.type.fbc: type = fn_type @Destroy.WithSelf.SelfDestruct.loc11 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.db3: %Destroy.WithSelf.SelfDestruct.type.fbc = 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: generated {
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl: %Destroy.WithSelf.SubobjectDestroy.type.dfc = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc11 [concrete = constants.%Destroy.WithSelf.SubobjectDestroy.d01] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.cb1 = ref_param_pattern [concrete = constants.%self.param_patt.65a]
// CHECK:STDOUT: %self.patt: %pattern_type.cb1 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.df1]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %empty_tuple.type = ref_param call_param0
// CHECK:STDOUT: %self: ref %empty_tuple.type = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.Op.decl: %Destroy.WithSelf.Op.type.ef0 = fn_decl @Destroy.WithSelf.Op.loc11 [concrete = constants.%Destroy.WithSelf.Op.403] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.cb1 = ref_param_pattern [concrete = constants.%self.param_patt.65a]
// CHECK:STDOUT: %self.patt: %pattern_type.cb1 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.df1]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %empty_tuple.type = ref_param call_param0
// CHECK:STDOUT: %self: ref %empty_tuple.type = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Main = %Main.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Main.decl: %Main.type = fn_decl @Main [concrete = constants.%Main] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Main() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.var.loc3: ref %empty_tuple.type = var_storage %x.var_patt.loc3
// CHECK:STDOUT: %.loc3_23.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc3_23.2: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc3_3: init %empty_tuple.type = converted %.loc3_23.1, %.loc3_23.2 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: assign %x.var.loc3, %.loc3_3
// CHECK:STDOUT: %.loc3_18.1: type = splice_block %.loc3_18.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc3_18.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc3_18.3: type = converted %.loc3_18.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.loc3: ref %empty_tuple.type = wrapper_binding x, %x.var.loc3
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt.loc3: %pattern_type.cb1 = ref_binding_pattern x [concrete = constants.%x.patt.06838d.1]
// CHECK:STDOUT: %x.var_patt.loc3: %pattern_type.cb1 = var_pattern %x.patt.loc3 [concrete = constants.%x.var_patt.28d573.1]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.var.loc11: ref %empty_tuple.type = var_storage %x.var_patt.loc11
// CHECK:STDOUT: %.loc11_23.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc11_23.2: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc11_3: init %empty_tuple.type = converted %.loc11_23.1, %.loc11_23.2 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: assign %x.var.loc11, %.loc11_3
// CHECK:STDOUT: %.loc11_18.1: type = splice_block %.loc11_18.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc11_18.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc11_18.3: type = converted %.loc11_18.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x.loc11: ref %empty_tuple.type = wrapper_binding x, %x.var.loc11
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt.loc11: %pattern_type.cb1 = ref_binding_pattern x [concrete = constants.%x.patt.06838d.2]
// CHECK:STDOUT: %x.var_patt.loc11: %pattern_type.cb1 = var_pattern %x.patt.loc11 [concrete = constants.%x.var_patt.28d573.2]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.bound.loc11: <bound method> = bound_method %x.var.loc11, constants.%Destroy.WithSelf.SelfDestruct.db3
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.call.loc11: init %empty_tuple.type = call %Destroy.WithSelf.SelfDestruct.bound.loc11(%x.var.loc11)
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.bound.loc3: <bound method> = bound_method %x.var.loc3, constants.%Destroy.WithSelf.SelfDestruct.db3
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.call.loc3: init %empty_tuple.type = call %Destroy.WithSelf.SelfDestruct.bound.loc3(%x.var.loc3)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SubobjectDestroy.loc11(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc11(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc11(%self.param: ref %empty_tuple.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.Op.decl(%self.param)
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.SubobjectDestroy.decl(%self.param)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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