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d60900cbeb71717fcfaa68b298d753ecc7e9b9dc
carbon-lang/toolchain/check/testdata/facet/self_in_interface_param.carbon
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Richard Smith d60900cbeb Remove special case for returning value expressions by copy (#6052) 
When returning a value from a function whose return type has a by-copy
initializing representation, perform initialization like we do when the
return type has an in-place initializing representation. This makes our
SemIR representation more uniform, as the return expression will now
always be an initializing expression rather than a value expression, but
more importantly it means that attempts to return a non-copyable type by
value now fail, even if the type has a by-copy initializing
representation.

This catches a bunch of places where we were returning a value of an
unconstrained template parameter `T:! type`, which we were incorrectly
allowing because we didn't notice it was not copyable. Unfortunately
this then requires quite a few test updates.

Like #6034, this exposes a lowering issue where lowering crashes when
attempting to lower a specific copy operation for certain types; a
couple more tests are temporarily disabled here. An upcoming PR
dependent on this one will fix the issue and re-enable those tests.
2025-09-12 00:13:33 +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/none.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/facet/self_in_interface_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/facet/self_in_interface_param.carbon
interface I(T:! type) {
let I1:! type;
}
//@dump-sem-ir-begin
fn F(T:! I(.Self) where .I1 = ()) -> T.I1 {
return ();
}
//@dump-sem-ir-end
fn G(_:! I(.Self) where .I1 = ()) {}
// CHECK:STDOUT: --- self_in_interface_param.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.eb1: %type = bind_symbolic_name .Self [symbolic_self]
// CHECK:STDOUT: %I.type.dac: type = generic_interface_type @I [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %I.generic: %I.type.dac = struct_value () [concrete]
// CHECK:STDOUT: %.Self.as_type.552: type = facet_access_type %.Self.eb1 [symbolic_self]
// CHECK:STDOUT: %I.type.b34: type = facet_type <@I, @I(%.Self.as_type.552)> [symbolic_self]
// CHECK:STDOUT: %.Self.d3f: %I.type.b34 = bind_symbolic_name .Self [symbolic_self]
// CHECK:STDOUT: %I.assoc_type.664: type = assoc_entity_type @I, @I(%.Self.as_type.552) [symbolic_self]
// CHECK:STDOUT: %assoc0.cdd: %I.assoc_type.664 = assoc_entity element0, @I.%I1 [symbolic_self]
// CHECK:STDOUT: %.Self.as_type.166: type = facet_access_type %.Self.d3f [symbolic_self]
// CHECK:STDOUT: %I.lookup_impl_witness.587: <witness> = lookup_impl_witness %.Self.d3f, @I, @I(%.Self.as_type.552) [symbolic_self]
// CHECK:STDOUT: %impl.elem0: type = impl_witness_access %I.lookup_impl_witness.587, element0 [symbolic_self]
// CHECK:STDOUT: %I_where.type: type = facet_type <@I, @I(%.Self.as_type.552) where %impl.elem0 = %empty_tuple.type> [symbolic_self]
// CHECK:STDOUT: %T.787: %I_where.type = bind_symbolic_name T, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.43c: type = pattern_type %I_where.type [symbolic_self]
// CHECK:STDOUT: %T.as_type: type = facet_access_type %T.787 [symbolic]
// CHECK:STDOUT: %I.lookup_impl_witness.845: <witness> = lookup_impl_witness %T.787, @I, @I(%.Self.as_type.552) [symbolic]
// CHECK:STDOUT: %pattern_type.cb1: type = pattern_type %empty_tuple.type [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %T.patt: %pattern_type.43c = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.cb1 = return_slot_pattern [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.cb1 = out_param_pattern %return.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %T.ref: %I_where.type = name_ref T, %T.loc18_6.2 [symbolic = %T.loc18_6.1 (constants.%T.787)]
// CHECK:STDOUT: %.loc18_39.1: %I.assoc_type.664 = specific_constant @I1.%assoc0, @I(constants.%.Self.as_type.552) [symbolic_self = constants.%assoc0.cdd]
// CHECK:STDOUT: %I1.ref.loc18_39: %I.assoc_type.664 = name_ref I1, %.loc18_39.1 [symbolic_self = constants.%assoc0.cdd]
// CHECK:STDOUT: %T.as_type.loc18_39.2: type = facet_access_type %T.ref [symbolic = %T.as_type.loc18_39.1 (constants.%T.as_type)]
// CHECK:STDOUT: %.loc18_39.2: type = converted %T.ref, %T.as_type.loc18_39.2 [symbolic = %T.as_type.loc18_39.1 (constants.%T.as_type)]
// CHECK:STDOUT: %impl.elem0.loc18_39: type = impl_witness_access constants.%I.lookup_impl_witness.845, element0 [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc18_19.1: type = splice_block %.loc18_19.2 [symbolic_self = constants.%I_where.type] {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %I.ref: %I.type.dac = name_ref I, file.%I.decl [concrete = constants.%I.generic]
// CHECK:STDOUT: %.Self.ref.loc18_12: %type = name_ref .Self, %.Self.1 [symbolic_self = constants.%.Self.eb1]
// CHECK:STDOUT: %.Self.as_type.loc18_17: type = facet_access_type %.Self.ref.loc18_12 [symbolic_self = constants.%.Self.as_type.552]
// CHECK:STDOUT: %.loc18_17: type = converted %.Self.ref.loc18_12, %.Self.as_type.loc18_17 [symbolic_self = constants.%.Self.as_type.552]
// CHECK:STDOUT: %I.type: type = facet_type <@I, @I(constants.%.Self.as_type.552)> [symbolic_self = constants.%I.type.b34]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %.Self.ref.loc18_25: %I.type.b34 = name_ref .Self, %.Self.2 [symbolic_self = constants.%.Self.d3f]
// CHECK:STDOUT: %.loc18_25.1: %I.assoc_type.664 = specific_constant @I1.%assoc0, @I(constants.%.Self.as_type.552) [symbolic_self = constants.%assoc0.cdd]
// CHECK:STDOUT: %I1.ref.loc18_25: %I.assoc_type.664 = name_ref I1, %.loc18_25.1 [symbolic_self = constants.%assoc0.cdd]
// CHECK:STDOUT: %.Self.as_type.loc18_25: type = facet_access_type %.Self.ref.loc18_25 [symbolic_self = constants.%.Self.as_type.166]
// CHECK:STDOUT: %.loc18_25.2: type = converted %.Self.ref.loc18_25, %.Self.as_type.loc18_25 [symbolic_self = constants.%.Self.as_type.166]
// CHECK:STDOUT: %impl.elem0.loc18_25: type = impl_witness_access constants.%I.lookup_impl_witness.587, element0 [symbolic_self = constants.%impl.elem0]
// CHECK:STDOUT: %.loc18_32.1: %empty_tuple.type = tuple_literal ()
// CHECK:STDOUT: %.loc18_32.2: type = converted %.loc18_32.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc18_19.2: type = where_expr %.Self.2 [symbolic_self = constants.%I_where.type] {
// CHECK:STDOUT: requirement_base_facet_type constants.%I.type.b34
// CHECK:STDOUT: requirement_rewrite %impl.elem0.loc18_25, %.loc18_32.2
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc18_6.2: %I_where.type = bind_symbolic_name T, 0 [symbolic = %T.loc18_6.1 (constants.%T.787)]
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param0
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F(%T.loc18_6.2: %I_where.type) {
// CHECK:STDOUT: %T.loc18_6.1: %I_where.type = bind_symbolic_name T, 0 [symbolic = %T.loc18_6.1 (constants.%T.787)]
// CHECK:STDOUT: %T.as_type.loc18_39.1: type = facet_access_type %T.loc18_6.1 [symbolic = %T.as_type.loc18_39.1 (constants.%T.as_type)]
// CHECK:STDOUT: %I.lookup_impl_witness: <witness> = lookup_impl_witness %T.loc18_6.1, @I, @I(constants.%.Self.as_type.552) [symbolic = %I.lookup_impl_witness (constants.%I.lookup_impl_witness.845)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
// CHECK:STDOUT: fn() -> %empty_tuple.type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %.loc19_11.1: %empty_tuple.type = tuple_literal ()
// CHECK:STDOUT: %.loc19_11.2: init %empty_tuple.type = tuple_init () to %return [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc19_12: init %empty_tuple.type = converted %.loc19_11.1, %.loc19_11.2 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: return %.loc19_12 to %return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%T.787) {
// CHECK:STDOUT: %T.loc18_6.1 => constants.%T.787
// CHECK:STDOUT: %T.as_type.loc18_39.1 => constants.%T.as_type
// CHECK:STDOUT: %I.lookup_impl_witness => constants.%I.lookup_impl_witness.845
// CHECK:STDOUT: }
// CHECK:STDOUT:
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