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carbon-lang/toolchain/check/testdata/var/initialization.carbon
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Christopher Di Bella 05a7ecbd34 Move SubobjectDestroy and SelfDestruct out of interface Destroy (#7942) 
Determining that a type has trivial destruction requires checking
whether all of its subobjects have trivial destruction and whether its
type has a custom witness for `Destroy.Op`. This isn't possible when
`Destroy` is the custodian for `Destroy.Op` and `SubobjectDestroy.Op`,
so we need to make `SubobjectDestroy` its own interface.

`Destroy.SelfDestruct` becomes a standalone function because it depends
on `SubobjectDestroy` and `Destroy` being implemented, and is also
responsible for generating any custom witnesses for both interfaces.
Making `SelfDestruct` an interface was experimented with, but this
required a blanket impl that caused issues for facet types.

`Destroy` depends on `SubobjectDestroy` to be implemented. We'd ideally
use `require impls SubobjectDestroy`, but it isn't complete yet, and it
also causes problems when `Destroy` is implemented inside the class
definition. We work around this by temporarily renaming the `Destroy`
interface to `DestroyImpl`, and introducing a constraint called
`Destroy` so that user code doesn't need to write `Core.SubobjectDestroy
& Core.Destroy`.
2026-10-26 21:35:01 +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+2]]:3-18: error: cannot convert type `A` into type implementing `Core.DefaultOrUnformed` [ConversionFailureTypeToFacet]
// 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: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %SubobjectDestroy.type: type = facet_type <@SubobjectDestroy> [concrete]
// CHECK:STDOUT: %T.09f: %SubobjectDestroy.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.type.dea: type = fn_type @T.as_type.as.DestroyImpl.impl.Op, @T.as_type.as.DestroyImpl.impl(%T.09f) [symbolic]
// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.6e5: %T.as_type.as.DestroyImpl.impl.Op.type.dea = struct_value () [symbolic]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.type.687: type = fn_type @SubobjectDestroy.WithSelf.Op.loc8 [concrete]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.30f: %SubobjectDestroy.WithSelf.Op.type.687 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b80: <witness> = custom_witness (%SubobjectDestroy.WithSelf.Op.30f), @SubobjectDestroy [concrete]
// CHECK:STDOUT: %SubobjectDestroy.facet.f89: %SubobjectDestroy.type = facet_value %empty_tuple.type, (%custom_witness.b80) [concrete]
// CHECK:STDOUT: %DestroyImpl.impl_witness.674: <witness> = impl_witness imports.%DestroyImpl.impl_witness_table, @T.as_type.as.DestroyImpl.impl(%SubobjectDestroy.facet.f89) [concrete]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %empty_tuple.type, (%DestroyImpl.impl_witness.674, %custom_witness.b80) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.74d: @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op.type (%T.as_type.as.DestroyImpl.impl.Op.type.dea) = import_ref Core//prelude/parts/destroy, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op (constants.%T.as_type.as.DestroyImpl.impl.Op.6e5)]
// CHECK:STDOUT: %DestroyImpl.impl_witness_table = impl_witness_table (%Core.import_ref.74d), @T.as_type.as.DestroyImpl.impl [concrete]
// 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_3.1: init %empty_tuple.type = converted %.loc8_23.1, %.loc8_23.2 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: assign %x.var, %.loc8_3.1
// 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.facet.loc8_3.1: %Destroy.type = facet_value constants.%empty_tuple.type, (constants.%DestroyImpl.impl_witness.674, constants.%custom_witness.b80) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc8_3.2: %Destroy.type = converted constants.%empty_tuple.type, %Destroy.facet.loc8_3.1 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %Destroy.facet.loc8_3.2: %Destroy.type = facet_value constants.%empty_tuple.type, (constants.%DestroyImpl.impl_witness.674, constants.%custom_witness.b80) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc8_3.3: %Destroy.type = converted constants.%empty_tuple.type, %Destroy.facet.loc8_3.2 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %SelfDestruct.call: init %empty_tuple.type = call %SelfDestruct.specific_fn(%x.var)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc8(%self.param: ref %empty_tuple.type) = "no_op";
// 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: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %SubobjectDestroy.type: type = facet_type <@SubobjectDestroy> [concrete]
// CHECK:STDOUT: %T.09f: %SubobjectDestroy.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.type.dea: type = fn_type @T.as_type.as.DestroyImpl.impl.Op, @T.as_type.as.DestroyImpl.impl(%T.09f) [symbolic]
// CHECK:STDOUT: %T.as_type.as.DestroyImpl.impl.Op.6e5: %T.as_type.as.DestroyImpl.impl.Op.type.dea = struct_value () [symbolic]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.type.687: type = fn_type @SubobjectDestroy.WithSelf.Op.loc8 [concrete]
// CHECK:STDOUT: %SubobjectDestroy.WithSelf.Op.30f: %SubobjectDestroy.WithSelf.Op.type.687 = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.b80: <witness> = custom_witness (%SubobjectDestroy.WithSelf.Op.30f), @SubobjectDestroy [concrete]
// CHECK:STDOUT: %SubobjectDestroy.facet.f89: %SubobjectDestroy.type = facet_value %empty_tuple.type, (%custom_witness.b80) [concrete]
// CHECK:STDOUT: %DestroyImpl.impl_witness.674: <witness> = impl_witness imports.%DestroyImpl.impl_witness_table, @T.as_type.as.DestroyImpl.impl(%SubobjectDestroy.facet.f89) [concrete]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %empty_tuple.type, (%DestroyImpl.impl_witness.674, %custom_witness.b80) [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: %Core.import_ref.74d: @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op.type (%T.as_type.as.DestroyImpl.impl.Op.type.dea) = import_ref Core//prelude/parts/destroy, loc{{\d+_\d+}}, loaded [symbolic = @T.as_type.as.DestroyImpl.impl.%T.as_type.as.DestroyImpl.impl.Op (constants.%T.as_type.as.DestroyImpl.impl.Op.6e5)]
// CHECK:STDOUT: %DestroyImpl.impl_witness_table = impl_witness_table (%Core.import_ref.74d), @T.as_type.as.DestroyImpl.impl [concrete]
// 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.facet.loc8_3.1: %Destroy.type = facet_value constants.%empty_tuple.type, (constants.%DestroyImpl.impl_witness.674, constants.%custom_witness.b80) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc8_3.1: %Destroy.type = converted constants.%empty_tuple.type, %Destroy.facet.loc8_3.1 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %Destroy.facet.loc8_3.2: %Destroy.type = facet_value constants.%empty_tuple.type, (constants.%DestroyImpl.impl_witness.674, constants.%custom_witness.b80) [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: %.loc8_3.2: %Destroy.type = converted constants.%empty_tuple.type, %Destroy.facet.loc8_3.2 [concrete = constants.%Destroy.facet]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %SelfDestruct.call: init %empty_tuple.type = call %SelfDestruct.specific_fn(%x.var)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @SubobjectDestroy.WithSelf.Op.loc8(%self.param: ref %empty_tuple.type) = "no_op";
// CHECK:STDOUT:
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