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carbon-lang/toolchain/check/testdata/var/initialization.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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/var/initialization.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/var/initialization.carbon
// --- core.carbon
package Core;
interface DefaultOrUnformed {
fn Op() -> Self;
}
impl () as DefaultOrUnformed {
fn Op() -> Self { return (); }
}
// --- initialized.carbon
library "[[@TEST_NAME]]";
import Core;
fn Main() {
//@dump-sem-ir-begin
var unused x: () = ();
//@dump-sem-ir-end
}
// --- uninitialized.carbon
library "[[@TEST_NAME]]";
import Core;
fn Main() {
//@dump-sem-ir-begin
var unused x: ();
//@dump-sem-ir-end
}
// --- fail_uninitialized_no_impl.carbon
library "[[@TEST_NAME]]";
import Core;
class A {}
fn Main() {
// CHECK:STDERR: fail_uninitialized_no_impl.carbon:[[@LINE+4]]:3: error: cannot convert type `A` into type implementing `Core.DefaultOrUnformed` [ConversionFailureTypeToFacet]
// CHECK:STDERR: var unused x: A;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused x: A;
}
// CHECK:STDOUT: --- initialized.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [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: %pattern_type.cb1 = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.cb1 = var_pattern %x.patt [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.loc8 [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.loc8 [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.loc8 [concrete]
// CHECK:STDOUT: %Destroy.WithSelf.SelfDestruct.db3: %Destroy.WithSelf.SelfDestruct.type.fbc = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generated {
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl: %Destroy.WithSelf.SubobjectDestroy.type.dfc = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc8 [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.loc8 [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: fn @Main() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.var: ref %empty_tuple.type = var_storage %x.var_patt
// CHECK:STDOUT: %.loc8_23.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc8_23.2: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc8_3: init %empty_tuple.type = converted %.loc8_23.1, %.loc8_23.2 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: assign %x.var, %.loc8_3
// CHECK:STDOUT: %.loc8_18.1: type = splice_block %.loc8_18.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc8_18.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc8_18.3: type = converted %.loc8_18.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x: ref %empty_tuple.type = wrapper_binding x, %x.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.cb1 = ref_binding_pattern x [concrete = constants.%x.patt]
// CHECK:STDOUT: %x.var_patt: %pattern_type.cb1 = 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.db3
// 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.loc8(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc8(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc8(%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:
// CHECK:STDOUT: --- uninitialized.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [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: %pattern_type.cb1 = ref_binding_pattern x [concrete]
// CHECK:STDOUT: %x.var_patt: %pattern_type.cb1 = var_pattern %x.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %empty_tuple.type, (%DefaultOrUnformed.impl_witness) [concrete]
// CHECK:STDOUT: %empty_tuple.type.as.DefaultOrUnformed.impl.Op.type: type = fn_type @empty_tuple.type.as.DefaultOrUnformed.impl.Op [concrete]
// CHECK:STDOUT: %empty_tuple.type.as.DefaultOrUnformed.impl.Op: %empty_tuple.type.as.DefaultOrUnformed.impl.Op.type = struct_value () [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.loc8 [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.loc8 [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.loc8 [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.import_ref.9c3: %empty_tuple.type.as.DefaultOrUnformed.impl.Op.type = import_ref Core//default, loc{{\d+_\d+}}, loaded [concrete = constants.%empty_tuple.type.as.DefaultOrUnformed.impl.Op]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table = impl_witness_table (%Core.import_ref.9c3), @empty_tuple.type.as.DefaultOrUnformed.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generated {
// CHECK:STDOUT: %Destroy.WithSelf.SubobjectDestroy.decl: %Destroy.WithSelf.SubobjectDestroy.type.dfc = fn_decl @Destroy.WithSelf.SubobjectDestroy.loc8 [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.loc8 [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: fn @Main() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %x.var: ref %empty_tuple.type = var_storage %x.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%empty_tuple.type, (constants.%DefaultOrUnformed.impl_witness) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc8_19.1: %DefaultOrUnformed.type = converted constants.%empty_tuple.type, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc8_19.1 [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc8_19.2: type = converted %.loc8_19.1, %as_type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %empty_tuple.type.as.DefaultOrUnformed.impl.Op.call: init %empty_tuple.type = call constants.%empty_tuple.type.as.DefaultOrUnformed.impl.Op()
// CHECK:STDOUT: assign %x.var, %empty_tuple.type.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: %.loc8_18.1: type = splice_block %.loc8_18.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc8_18.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc8_18.3: type = converted %.loc8_18.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x: ref %empty_tuple.type = wrapper_binding x, %x.var
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %x.patt: %pattern_type.cb1 = ref_binding_pattern x [concrete = constants.%x.patt]
// CHECK:STDOUT: %x.var_patt: %pattern_type.cb1 = 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.db3
// 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.loc8(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.Op.loc8(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.WithSelf.SelfDestruct.loc8(%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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