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carbon-lang/toolchain/check/testdata/class/init_as.carbon
T
Richard Smith 2e5b195813 Make {} as Class an initializing expression. (#6882) 
Previously we forced a temporary materialization, resulting in it being
treated as an ephemeral reference expression. This change allows

```carbon
var x: Class = {} as Class;
```

even when `Class` is not copyable.
2026-03-11 20:21:21 +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/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/class/init_as.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/init_as.carbon
class Class {
var a: i32;
var b: i32;
}
fn F() -> i32 {
//@dump-sem-ir-begin
return ({.a = 1, .b = 2} as Class).a;
//@dump-sem-ir-end
}
fn G() -> i32 {
//@dump-sem-ir-begin
var v: Class = {.a = 1, .b = 2} as Class;
//@dump-sem-ir-end
return v.a;
}
// CHECK:STDOUT: --- init_as.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Class: type = class_type @Class [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %Class.elem: type = unbound_element_type %Class, %i32 [concrete]
// CHECK:STDOUT: %int_1.5b8: Core.IntLiteral = int_value 1 [concrete]
// CHECK:STDOUT: %int_2.ecc: Core.IntLiteral = int_value 2 [concrete]
// CHECK:STDOUT: %struct_type.a.b.cfd: type = struct_type {.a: Core.IntLiteral, .b: Core.IntLiteral} [concrete]
// CHECK:STDOUT: %struct: %struct_type.a.b.cfd = struct_value (%int_1.5b8, %int_2.ecc) [concrete]
// CHECK:STDOUT: %ImplicitAs.type.e8c: type = facet_type <@ImplicitAs, @ImplicitAs(%i32)> [concrete]
// CHECK:STDOUT: %To: Core.IntLiteral = symbolic_binding To, 0 [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.4e6: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%To) [symbolic]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.3c2: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.4e6 = struct_value () [symbolic]
// CHECK:STDOUT: %ImplicitAs.impl_witness.6bc: <witness> = impl_witness imports.%ImplicitAs.impl_witness_table.74f, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e0d: type = fn_type @Core.IntLiteral.as.ImplicitAs.impl.Convert, @Core.IntLiteral.as.ImplicitAs.impl(%int_32) [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5: %Core.IntLiteral.as.ImplicitAs.impl.Convert.type.e0d = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.facet: %ImplicitAs.type.e8c = facet_value Core.IntLiteral, (%ImplicitAs.impl_witness.6bc) [concrete]
// CHECK:STDOUT: %ImplicitAs.WithSelf.Convert.type.b37: type = fn_type @ImplicitAs.WithSelf.Convert, @ImplicitAs.WithSelf(%i32, %ImplicitAs.facet) [concrete]
// CHECK:STDOUT: %.545: type = fn_type_with_self_type %ImplicitAs.WithSelf.Convert.type.b37, %ImplicitAs.facet [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.215: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn: <specific function> = specific_function %Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5, @Core.IntLiteral.as.ImplicitAs.impl.Convert(%int_32) [concrete]
// CHECK:STDOUT: %bound_method.38b: <bound method> = bound_method %int_1.5b8, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_1.5d2: %i32 = int_value 1 [concrete]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.4e5: <bound method> = bound_method %int_2.ecc, %Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5 [concrete]
// CHECK:STDOUT: %bound_method.646: <bound method> = bound_method %int_2.ecc, %Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn [concrete]
// CHECK:STDOUT: %int_2.ef8: %i32 = int_value 2 [concrete]
// CHECK:STDOUT: %Class.val: %Class = struct_value (%int_1.5d2, %int_2.ef8) [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.824: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.9b9: %Int.as.Copy.impl.Op.type.824 = struct_value () [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.f17: <witness> = impl_witness imports.%Copy.impl_witness_table.e76, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.546: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.664: %Int.as.Copy.impl.Op.type.546 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %i32, (%Copy.impl_witness.f17) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.081: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.8e2: type = fn_type_with_self_type %Copy.WithSelf.Op.type.081, %Copy.facet [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.664, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.904: type = pattern_type %Class [concrete]
// CHECK:STDOUT: %Destroy.Op.type: type = fn_type @Destroy.Op [concrete]
// CHECK:STDOUT: %Destroy.Op: %Destroy.Op.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core.import_ref.42d: @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert.type (%Core.IntLiteral.as.ImplicitAs.impl.Convert.type.4e6) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Core.IntLiteral.as.ImplicitAs.impl.%Core.IntLiteral.as.ImplicitAs.impl.Convert (constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.3c2)]
// CHECK:STDOUT: %ImplicitAs.impl_witness_table.74f = impl_witness_table (%Core.import_ref.42d), @Core.IntLiteral.as.ImplicitAs.impl [concrete]
// CHECK:STDOUT: %Core.import_ref.18d: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.824) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.9b9)]
// CHECK:STDOUT: %Copy.impl_witness_table.e76 = impl_witness_table (%Core.import_ref.18d), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %.loc20_26.1: %struct_type.a.b.cfd = struct_literal (%int_1, %int_2) [concrete = constants.%struct]
// CHECK:STDOUT: %Class.ref: type = name_ref Class, file.%Class.decl [concrete = constants.%Class]
// CHECK:STDOUT: %impl.elem0.loc20_26.1: %.545 = impl_witness_access constants.%ImplicitAs.impl_witness.6bc, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5]
// CHECK:STDOUT: %bound_method.loc20_26.1: <bound method> = bound_method %int_1, %impl.elem0.loc20_26.1 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.215]
// CHECK:STDOUT: %specific_fn.loc20_26.1: <specific function> = specific_function %impl.elem0.loc20_26.1, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc20_26.2: <bound method> = bound_method %int_1, %specific_fn.loc20_26.1 [concrete = constants.%bound_method.38b]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc20_26.1: init %i32 = call %bound_method.loc20_26.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc20_26.2: init %i32 = converted %int_1, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc20_26.1 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc20_26.3: ref %Class = temporary_storage
// CHECK:STDOUT: %.loc20_26.4: ref %i32 = class_element_access %.loc20_26.3, element0
// CHECK:STDOUT: %.loc20_26.5: init %i32 to %.loc20_26.4 = in_place_init %.loc20_26.2 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %impl.elem0.loc20_26.2: %.545 = impl_witness_access constants.%ImplicitAs.impl_witness.6bc, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5]
// CHECK:STDOUT: %bound_method.loc20_26.3: <bound method> = bound_method %int_2, %impl.elem0.loc20_26.2 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.4e5]
// CHECK:STDOUT: %specific_fn.loc20_26.2: <specific function> = specific_function %impl.elem0.loc20_26.2, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc20_26.4: <bound method> = bound_method %int_2, %specific_fn.loc20_26.2 [concrete = constants.%bound_method.646]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc20_26.2: init %i32 = call %bound_method.loc20_26.4(%int_2) [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc20_26.6: init %i32 = converted %int_2, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc20_26.2 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc20_26.7: ref %i32 = class_element_access %.loc20_26.3, element1
// CHECK:STDOUT: %.loc20_26.8: init %i32 to %.loc20_26.7 = in_place_init %.loc20_26.6 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc20_26.9: init %Class to %.loc20_26.3 = class_init (%.loc20_26.5, %.loc20_26.8) [concrete = constants.%Class.val]
// CHECK:STDOUT: %.loc20_28.1: init %Class = converted %.loc20_26.1, %.loc20_26.9 [concrete = constants.%Class.val]
// CHECK:STDOUT: %.loc20_28.2: ref %Class = temporary %.loc20_26.3, %.loc20_28.1
// CHECK:STDOUT: %a.ref: %Class.elem = name_ref a, @Class.%.loc14 [concrete = @Class.%.loc14]
// CHECK:STDOUT: %.loc20_37.1: ref %i32 = class_element_access %.loc20_28.2, element0
// CHECK:STDOUT: %.loc20_37.2: %i32 = acquire_value %.loc20_37.1
// CHECK:STDOUT: %impl.elem0.loc20_37: %.8e2 = impl_witness_access constants.%Copy.impl_witness.f17, element0 [concrete = constants.%Int.as.Copy.impl.Op.664]
// CHECK:STDOUT: %bound_method.loc20_37.1: <bound method> = bound_method %.loc20_37.2, %impl.elem0.loc20_37
// CHECK:STDOUT: %specific_fn.loc20_37: <specific function> = specific_function %impl.elem0.loc20_37, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc20_37.2: <bound method> = bound_method %.loc20_37.2, %specific_fn.loc20_37
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc20_37.2(%.loc20_37.2)
// CHECK:STDOUT: %Destroy.Op.bound: <bound method> = bound_method %.loc20_28.2, constants.%Destroy.Op
// CHECK:STDOUT: %Destroy.Op.call: init %empty_tuple.type = call %Destroy.Op.bound(%.loc20_28.2)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op(%self.param: ref %Class) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G() -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: %pattern_type.904 = ref_binding_pattern v [concrete]
// CHECK:STDOUT: %v.var_patt: %pattern_type.904 = var_pattern %v.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref %Class = var %v.var_patt
// CHECK:STDOUT: %int_1: Core.IntLiteral = int_value 1 [concrete = constants.%int_1.5b8]
// CHECK:STDOUT: %int_2: Core.IntLiteral = int_value 2 [concrete = constants.%int_2.ecc]
// CHECK:STDOUT: %.loc26_33.1: %struct_type.a.b.cfd = struct_literal (%int_1, %int_2) [concrete = constants.%struct]
// CHECK:STDOUT: %Class.ref.loc26_38: type = name_ref Class, file.%Class.decl [concrete = constants.%Class]
// CHECK:STDOUT: %impl.elem0.loc26_33.1: %.545 = impl_witness_access constants.%ImplicitAs.impl_witness.6bc, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5]
// CHECK:STDOUT: %bound_method.loc26_33.1: <bound method> = bound_method %int_1, %impl.elem0.loc26_33.1 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.215]
// CHECK:STDOUT: %specific_fn.loc26_33.1: <specific function> = specific_function %impl.elem0.loc26_33.1, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc26_33.2: <bound method> = bound_method %int_1, %specific_fn.loc26_33.1 [concrete = constants.%bound_method.38b]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc26_33.1: init %i32 = call %bound_method.loc26_33.2(%int_1) [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc26_33.2: init %i32 = converted %int_1, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc26_33.1 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %.loc26_3: ref %Class = splice_block %v.var {}
// CHECK:STDOUT: %.loc26_33.3: ref %i32 = class_element_access %.loc26_3, element0
// CHECK:STDOUT: %.loc26_33.4: init %i32 to %.loc26_33.3 = in_place_init %.loc26_33.2 [concrete = constants.%int_1.5d2]
// CHECK:STDOUT: %impl.elem0.loc26_33.2: %.545 = impl_witness_access constants.%ImplicitAs.impl_witness.6bc, element0 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.0b5]
// CHECK:STDOUT: %bound_method.loc26_33.3: <bound method> = bound_method %int_2, %impl.elem0.loc26_33.2 [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.bound.4e5]
// CHECK:STDOUT: %specific_fn.loc26_33.2: <specific function> = specific_function %impl.elem0.loc26_33.2, @Core.IntLiteral.as.ImplicitAs.impl.Convert(constants.%int_32) [concrete = constants.%Core.IntLiteral.as.ImplicitAs.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc26_33.4: <bound method> = bound_method %int_2, %specific_fn.loc26_33.2 [concrete = constants.%bound_method.646]
// CHECK:STDOUT: %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc26_33.2: init %i32 = call %bound_method.loc26_33.4(%int_2) [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc26_33.5: init %i32 = converted %int_2, %Core.IntLiteral.as.ImplicitAs.impl.Convert.call.loc26_33.2 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc26_33.6: ref %i32 = class_element_access %.loc26_3, element1
// CHECK:STDOUT: %.loc26_33.7: init %i32 to %.loc26_33.6 = in_place_init %.loc26_33.5 [concrete = constants.%int_2.ef8]
// CHECK:STDOUT: %.loc26_33.8: init %Class to %.loc26_3 = class_init (%.loc26_33.4, %.loc26_33.7) [concrete = constants.%Class.val]
// CHECK:STDOUT: %.loc26_35: init %Class = converted %.loc26_33.1, %.loc26_33.8 [concrete = constants.%Class.val]
// CHECK:STDOUT: assign %v.var, %.loc26_35
// CHECK:STDOUT: %Class.ref.loc26_10: type = name_ref Class, file.%Class.decl [concrete = constants.%Class]
// CHECK:STDOUT: %v: ref %Class = ref_binding v, %v.var
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %Destroy.Op.bound: <bound method> = bound_method %v.var, constants.%Destroy.Op
// CHECK:STDOUT: %Destroy.Op.call: init %empty_tuple.type = call %Destroy.Op.bound(%v.var)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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