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carbon-lang/toolchain/check/testdata/as/var_init.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/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/as/var_init.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/as/var_init.carbon
// --- var_init.carbon
library "[[@TEST_NAME]]";
class X {
impl () as Core.ImplicitAs(X) {
fn Convert(unused self: ()) -> X { return {}; }
}
}
fn Convert(unused t: ()) {
//@dump-sem-ir-begin
var unused x: X = ();
//@dump-sem-ir-end
}
// CHECK:STDOUT: --- var_init.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.type.7cc: type = facet_type <@ImplicitAs, @ImplicitAs(%X)> [concrete]
// CHECK:STDOUT: %ImplicitAs.impl_witness: <witness> = impl_witness @empty_tuple.type.as.ImplicitAs.impl.%ImplicitAs.impl_witness_table [concrete]
// CHECK:STDOUT: %pattern_type.6cb: type = pattern_type %X [concrete]
// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.type: type = fn_type @empty_tuple.type.as.ImplicitAs.impl.Convert [concrete]
// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert: %empty_tuple.type.as.ImplicitAs.impl.Convert.type = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.7cc = facet_value %empty_tuple.type, (%ImplicitAs.impl_witness) [concrete]
// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.dd7: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%X, %ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %x.patt: %pattern_type.6cb = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.6cb = var_pattern %x.patt [concrete]
// CHECK:STDOUT: %.b8c: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.dd7, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.bound: <bound method> = bound_method %empty_tuple, %empty_tuple.type.as.ImplicitAs.impl.Convert [concrete]
// CHECK:STDOUT: %pattern_type.a96: type = pattern_type %empty_struct_type [concrete]
// CHECK:STDOUT: %self.param_patt.52f: %pattern_type.a96 = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.4b1: %pattern_type.a96 = wrapper_binding_pattern self, %self.param_patt.52f [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.1: type = fn_type @Destroy.WithSelf.SubobjectDestroy.loc12_3.1 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.d01daf.1: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.1 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef016f.1: type = fn_type @Destroy.WithSelf.Op.loc12_3.1 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403171.1: %Destroy.WithSelf.Op.type.ef016f.1 = struct_value () [concrete]
// CHECK:STDOUT: %self.param_patt.925: %pattern_type.6cb = ref_param_pattern [concrete]
// CHECK:STDOUT: %self.patt.617: %pattern_type.6cb = wrapper_binding_pattern self, %self.param_patt.925 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.2: type = fn_type @Destroy.WithSelf.SubobjectDestroy.loc12_3.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.d01daf.2: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.2 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type.ef016f.2: type = fn_type @Destroy.WithSelf.Op.loc12_3.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.Op.403171.2: %Destroy.WithSelf.Op.type.ef016f.2 = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.type.fbceb5.2: type = fn_type @Destroy.WithSelf.SelfDestruct.loc12_3.2 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.db3fdb.2: %Destroy.WithSelf.SelfDestruct.type.fbceb5.2 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generated {
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl.763c71.1: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.1 = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc12_3.1 [concrete = constants.%Destroy.WithSelf.SubobjectDestroy.d01daf.1] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.a96 = ref_param_pattern [concrete = constants.%self.param_patt.52f]
// CHECK:STDOUT: %self.patt: %pattern_type.a96 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.4b1]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %empty_struct_type = ref_param call_param0
// CHECK:STDOUT: %self: ref %empty_struct_type = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.Op.decl.5f94cf.1: %Destroy.WithSelf.Op.type.ef016f.1 = fn_decl @Destroy.WithSelf.Op.loc12_3.1 [concrete = constants.%Destroy.WithSelf.Op.403171.1] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.a96 = ref_param_pattern [concrete = constants.%self.param_patt.52f]
// CHECK:STDOUT: %self.patt: %pattern_type.a96 = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.4b1]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %empty_struct_type = ref_param call_param0
// CHECK:STDOUT: %self: ref %empty_struct_type = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl.763c71.2: %Destroy.WithSelf.SubobjectDestroy.type.dfcbdb.2 = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc12_3.2 [concrete = constants.%Destroy.WithSelf.SubobjectDestroy.d01daf.2] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.6cb = ref_param_pattern [concrete = constants.%self.param_patt.925]
// CHECK:STDOUT: %self.patt: %pattern_type.6cb = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.617]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %X = ref_param call_param0
// CHECK:STDOUT: %self: ref %X = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.Op.decl.5f94cf.2: %Destroy.WithSelf.Op.type.ef016f.2 = fn_decl @Destroy.WithSelf.Op.loc12_3.2 [concrete = constants.%Destroy.WithSelf.Op.403171.2] {
// CHECK:STDOUT: %self.param_patt: %pattern_type.6cb = ref_param_pattern [concrete = constants.%self.param_patt.925]
// CHECK:STDOUT: %self.patt: %pattern_type.6cb = wrapper_binding_pattern self, %self.param_patt [concrete = constants.%self.patt.617]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: ref %X = ref_param call_param0
// CHECK:STDOUT: %self: ref %X = wrapper_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Convert(%t.param: %empty_tuple.type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.var: ref %X = var_storage %x.var_patt
// CHECK:STDOUT: %.loc12_22.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %impl.elem0: %.b8c = impl_witness_access constants.%ImplicitAs.impl_witness, element0 [concrete = constants.%empty_tuple.type.as.ImplicitAs.impl.Convert]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %.loc12_22.1, %impl.elem0 [concrete = constants.%empty_tuple.type.as.ImplicitAs.impl.Convert.bound]
// CHECK:STDOUT: %.loc12_3.1: ref %X = splice_block %x.var {}
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc12_22.2: %empty_tuple.type = converted %.loc12_22.1, %empty_tuple [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %empty_tuple.type.as.ImplicitAs.impl.Convert.call: init %X to %.loc12_3.1 = call %bound_method(%.loc12_22.2)
// CHECK:STDOUT: %.loc12_3.2: init %X = converted %.loc12_22.1, %empty_tuple.type.as.ImplicitAs.impl.Convert.call
// CHECK:STDOUT: assign %x.var, %.loc12_3.2
// CHECK:STDOUT: %X.ref: type = name_ref X, file.%X.decl [concrete = constants.%X]
// CHECK:STDOUT: %x: ref %X = wrapper_binding x, %x.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.6cb = ref_binding_pattern x [concrete = constants.%x.patt]
// CHECK:STDOUT: %x.var_patt: %pattern_type.6cb = var_pattern %x.patt [concrete = constants.%x.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.bound: <bound method> = bound_method %x.var, constants.%Destroy.WithSelf.SelfDestruct.db3fdb.2
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.call: init %empty_tuple.type = call %Destroy.WithSelf.SelfDestruct.bound(%x.var)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SubobjectDestroy.loc12_3.1(%self.param: ref %empty_struct_type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc12_3.1(%self.param: ref %empty_struct_type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc12_3.1(%self.param: ref %empty_struct_type) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.Op.decl.5f94cf.1(%self.param)
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.SubobjectDestroy.decl.763c71.1(%self.param)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SubobjectDestroy.loc12_3.2(%self.param: ref %X) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc12_3.2(%self.param: ref %X) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc12_3.2(%self.param: ref %X) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Destroy.WithSelf.Op.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.Op.decl.5f94cf.2(%self.param)
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.call: init %empty_tuple.type = call generated.%Destroy.WithSelf.SubobjectDestroy.decl.763c71.2(%self.param)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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