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carbon-lang/toolchain/check/testdata/interface/fail_assoc_const_alias.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +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/interface/fail_assoc_const_alias.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/fail_assoc_const_alias.carbon
// --- fail_alias_to_different_interface.carbon
library "[[@TEST_NAME]]";
interface I {
let T:! type;
}
interface J {
alias U = I.T;
// CHECK:STDERR: fail_alias_to_different_interface.carbon:[[@LINE+4]]:13: error: cannot convert type `Self` that implements `J` into type implementing `I` [ConversionFailureFacetToFacet]
// CHECK:STDERR: fn F() -> U;
// CHECK:STDERR: ^
// CHECK:STDERR:
fn F() -> U;
}
// --- alias_to_different_interface_with_requires.carbon
library "[[@TEST_NAME]]";
interface I2 {
let T2:! type;
}
interface J2;
impl forall [V:! J2] V as I2 where .T2 = () {}
//@dump-sem-ir-begin
interface J2 {
alias U2 = I2.T2;
fn F2() -> U2;
}
//@dump-sem-ir-end
// --- fail_call_method_alias.carbon
library "[[@TEST_NAME]]";
interface A {
fn F(self) -> type;
}
interface B {
alias F = A.F;
// CHECK:STDERR: fail_call_method_alias.carbon:[[@LINE+4]]:13: error: cannot convert type `Self` that implements `B` into type implementing `A` [ConversionFailureFacetToFacet]
// CHECK:STDERR: fn G() -> F();
// CHECK:STDERR: ^
// CHECK:STDERR:
fn G() -> F();
}
// --- call_with_compound_member_access.carbon
library "[[@TEST_NAME]]";
interface C {
fn F(self);
// TODO: Add `default` once supported.
fn G(self) {
//@dump-sem-ir-begin
self.F();
self.(F)();
//@dump-sem-ir-end
}
}
// CHECK:STDOUT: --- alias_to_different_interface_with_requires.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I2.type: type = facet_type <@I2> [concrete]
// CHECK:STDOUT: %I2.assoc_type: type = assoc_entity_type @I2 [concrete]
// CHECK:STDOUT: %assoc0.d6c: %I2.assoc_type = assoc_entity element0, @I2.WithSelf.%T2 [concrete]
// CHECK:STDOUT: %J2.type: type = facet_type <@J2> [concrete]
// CHECK:STDOUT: %Self.c1f: %J2.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self.c1f [symbolic]
// CHECK:STDOUT: %I2.lookup_impl_witness.b5c: <witness> = lookup_impl_witness %Self.c1f, @I2 [symbolic]
// CHECK:STDOUT: %.eef: require_specific_def_type = require_specific_def @V.as_type.as.I2.impl(%Self.c1f) [symbolic]
// CHECK:STDOUT: %I2.facet.39b: %I2.type = facet_value %Self.as_type, (%I2.lookup_impl_witness.b5c) [symbolic]
// CHECK:STDOUT: %impl.elem0.422: type = impl_witness_access %I2.lookup_impl_witness.b5c, element0 [symbolic]
// CHECK:STDOUT: %.932: Core.Form = init_form %impl.elem0.422 [symbolic]
// CHECK:STDOUT: %pattern_type.ff8: type = pattern_type %impl.elem0.422 [symbolic]
// CHECK:STDOUT: %return.param_patt: %pattern_type.ff8 = out_param_pattern [symbolic]
// CHECK:STDOUT: %return.patt: %pattern_type.ff8 = return_slot_pattern %return.param_patt, %impl.elem0.422 [symbolic]
// CHECK:STDOUT: %J2.WithSelf.F2.type: type = fn_type @J2.WithSelf.F2, @J2.WithSelf(%Self.c1f) [symbolic]
// CHECK:STDOUT: %J2.WithSelf.F2: %J2.WithSelf.F2.type = struct_value () [symbolic]
// CHECK:STDOUT: %J2.assoc_type: type = assoc_entity_type @J2 [concrete]
// CHECK:STDOUT: %assoc0.253: %J2.assoc_type = assoc_entity element0, @J2.WithSelf.%J2.WithSelf.F2.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %J2.decl.loc12: type = interface_decl @J2 [concrete = constants.%J2.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @J2 {
// CHECK:STDOUT: %Self: %J2.type = symbolic_binding Self, 0 [symbolic = constants.%Self.c1f]
// CHECK:STDOUT: %J2.WithSelf.decl = interface_with_self_decl @J2 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %I2.ref: type = name_ref I2, file.%I2.decl [concrete = constants.%I2.type]
// CHECK:STDOUT: %T2.ref: %I2.assoc_type = name_ref T2, @T2.%assoc0 [concrete = constants.%assoc0.d6c]
// CHECK:STDOUT: %U2: %I2.assoc_type = alias_binding U2, %T2.ref [concrete = constants.%assoc0.d6c]
// CHECK:STDOUT: %J2.WithSelf.F2.decl: @J2.WithSelf.%J2.WithSelf.F2.type (%J2.WithSelf.F2.type) = fn_decl @J2.WithSelf.F2 [symbolic = @J2.WithSelf.%J2.WithSelf.F2 (constants.%J2.WithSelf.F2)] {
// CHECK:STDOUT: %return.param_patt.loc14_14.1: @J2.WithSelf.F2.%pattern_type (%pattern_type.ff8) = out_param_pattern [symbolic = %return.param_patt.loc14_14.2 (constants.%return.param_patt)]
// CHECK:STDOUT: %return.patt.loc14_11.1: @J2.WithSelf.F2.%pattern_type (%pattern_type.ff8) = return_slot_pattern %return.param_patt.loc14_14.1, %U2.ref [symbolic = %return.patt.loc14_11.2 (constants.%return.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %Self.as_type.loc14_14.2: type = facet_access_type @J2.%Self [symbolic = %Self.as_type.loc14_14.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %I2.facet.loc14_14.2: %I2.type = facet_value %Self.as_type.loc14_14.2, (constants.%I2.lookup_impl_witness.b5c) [symbolic = %I2.facet.loc14_14.1 (constants.%I2.facet.39b)]
// CHECK:STDOUT: %.loc14_14.3: %I2.type = converted @J2.%Self, %I2.facet.loc14_14.2 [symbolic = %I2.facet.loc14_14.1 (constants.%I2.facet.39b)]
// CHECK:STDOUT: %impl.elem0.loc14_14.2: type = impl_witness_access constants.%I2.lookup_impl_witness.b5c, element0 [symbolic = %impl.elem0.loc14_14.1 (constants.%impl.elem0.422)]
// CHECK:STDOUT: %U2.ref: type = name_ref U2, %impl.elem0.loc14_14.2 [symbolic = %impl.elem0.loc14_14.1 (constants.%impl.elem0.422)]
// CHECK:STDOUT: %.loc14_14.4: Core.Form = init_form %U2.ref [symbolic = %.loc14_14.2 (constants.%.932)]
// CHECK:STDOUT: %return.param: ref @J2.WithSelf.F2.%impl.elem0.loc14_14.1 (%impl.elem0.422) = out_param call_param0
// CHECK:STDOUT: %return: ref @J2.WithSelf.F2.%impl.elem0.loc14_14.1 (%impl.elem0.422) = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %J2.assoc_type = assoc_entity element0, %J2.WithSelf.F2.decl [concrete = constants.%assoc0.253]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .I2 = <poisoned>
// CHECK:STDOUT: .I2 = <poisoned>
// CHECK:STDOUT: .U2 = @J2.WithSelf.%U2
// CHECK:STDOUT: .F2 = @J2.WithSelf.%assoc0
// CHECK:STDOUT: witness = (@J2.WithSelf.%J2.WithSelf.F2.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @J2.WithSelf.F2(@J2.%Self: %J2.type) {
// CHECK:STDOUT: %Self: %J2.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.c1f)]
// CHECK:STDOUT: %Self.as_type.loc14_14.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc14_14.1 (constants.%Self.as_type)]
// CHECK:STDOUT: %.loc14_14.1: require_specific_def_type = require_specific_def @V.as_type.as.I2.impl(%Self) [symbolic = %.loc14_14.1 (constants.%.eef)]
// CHECK:STDOUT: %I2.lookup_impl_witness: <witness> = lookup_impl_witness %Self, @I2 [symbolic = %I2.lookup_impl_witness (constants.%I2.lookup_impl_witness.b5c)]
// CHECK:STDOUT: %I2.facet.loc14_14.1: %I2.type = facet_value %Self.as_type.loc14_14.1, (%I2.lookup_impl_witness) [symbolic = %I2.facet.loc14_14.1 (constants.%I2.facet.39b)]
// CHECK:STDOUT: %impl.elem0.loc14_14.1: type = impl_witness_access %I2.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc14_14.1 (constants.%impl.elem0.422)]
// CHECK:STDOUT: %.loc14_14.2: Core.Form = init_form %impl.elem0.loc14_14.1 [symbolic = %.loc14_14.2 (constants.%.932)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %impl.elem0.loc14_14.1 [symbolic = %pattern_type (constants.%pattern_type.ff8)]
// CHECK:STDOUT: %return.param_patt.loc14_14.2: @J2.WithSelf.F2.%pattern_type (%pattern_type.ff8) = out_param_pattern [symbolic = %return.param_patt.loc14_14.2 (constants.%return.param_patt)]
// CHECK:STDOUT: %return.patt.loc14_11.2: @J2.WithSelf.F2.%pattern_type (%pattern_type.ff8) = return_slot_pattern %return.param_patt.loc14_14.2, %impl.elem0.loc14_14.1 [symbolic = %return.patt.loc14_11.2 (constants.%return.patt)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() -> out %return.param: @J2.WithSelf.F2.%impl.elem0.loc14_14.1 (%impl.elem0.422);
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @J2.WithSelf(constants.%Self.c1f) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @J2.WithSelf.F2(constants.%Self.c1f) {
// CHECK:STDOUT: %Self => constants.%Self.c1f
// CHECK:STDOUT: %Self.as_type.loc14_14.1 => constants.%Self.as_type
// CHECK:STDOUT: %.loc14_14.1 => constants.%.eef
// CHECK:STDOUT: %I2.lookup_impl_witness => constants.%I2.lookup_impl_witness.b5c
// CHECK:STDOUT: %I2.facet.loc14_14.1 => constants.%I2.facet.39b
// CHECK:STDOUT: %impl.elem0.loc14_14.1 => constants.%impl.elem0.422
// CHECK:STDOUT: %.loc14_14.2 => constants.%.932
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.ff8
// CHECK:STDOUT: %return.param_patt.loc14_14.2 => constants.%return.param_patt
// CHECK:STDOUT: %return.patt.loc14_11.2 => constants.%return.patt
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- call_with_compound_member_access.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C.type: type = facet_type <@C> [concrete]
// CHECK:STDOUT: %Self: %C.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.as_type [symbolic]
// CHECK:STDOUT: %self.param_patt: %pattern_type = value_param_pattern [symbolic]
// CHECK:STDOUT: %self.patt: %pattern_type = at_binding_pattern self, %self.param_patt [symbolic]
// CHECK:STDOUT: %C.WithSelf.F.type: type = fn_type @C.WithSelf.F, @C.WithSelf(%Self) [symbolic]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %C.WithSelf.F: %C.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %C.assoc_type: type = assoc_entity_type @C [concrete]
// CHECK:STDOUT: %assoc0: %C.assoc_type = assoc_entity element0, @C.WithSelf.%C.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %C.WithSelf.G.type: type = fn_type @C.WithSelf.G, @C.WithSelf(%Self) [symbolic]
// CHECK:STDOUT: %C.WithSelf.G: %C.WithSelf.G.type = struct_value () [symbolic]
// CHECK:STDOUT: %C.lookup_impl_witness: <witness> = lookup_impl_witness %Self, @C [symbolic]
// CHECK:STDOUT: %.b5a: type = fn_type_with_self_type %C.WithSelf.F.type, %Self [symbolic]
// CHECK:STDOUT: %impl.elem0: %.b5a = impl_witness_access %C.lookup_impl_witness, element0 [symbolic]
// CHECK:STDOUT: %specific_impl_fn: <specific function> = specific_impl_function %impl.elem0, @C.WithSelf.F(%Self) [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @C {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @C.WithSelf.%assoc0
// CHECK:STDOUT: .G = @C.WithSelf.%assoc1
// CHECK:STDOUT: witness = (@C.WithSelf.%C.WithSelf.F.decl, @C.WithSelf.%C.WithSelf.G.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @C.WithSelf.G(@C.%Self: %C.type) {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %C.WithSelf.F.type: type = fn_type @C.WithSelf.F, @C.WithSelf(%Self) [symbolic = %C.WithSelf.F.type (constants.%C.WithSelf.F.type)]
// CHECK:STDOUT: %.loc8_9: type = fn_type_with_self_type %C.WithSelf.F.type, %Self [symbolic = %.loc8_9 (constants.%.b5a)]
// CHECK:STDOUT: %C.lookup_impl_witness: <witness> = lookup_impl_witness %Self, @C [symbolic = %C.lookup_impl_witness (constants.%C.lookup_impl_witness)]
// CHECK:STDOUT: %impl.elem0.loc8_9.2: @C.WithSelf.G.%.loc8_9 (%.b5a) = impl_witness_access %C.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc8_9.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %specific_impl_fn.loc8_9.2: <specific function> = specific_impl_function %impl.elem0.loc8_9.2, @C.WithSelf.F(%Self) [symbolic = %specific_impl_fn.loc8_9.2 (constants.%specific_impl_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @C.WithSelf.G.%Self.as_type.loc6_8.1 (%Self.as_type)) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %self.ref.loc8: @C.WithSelf.G.%Self.as_type.loc6_8.1 (%Self.as_type) = name_ref self, %self
// CHECK:STDOUT: %F.ref.loc8: %C.assoc_type = name_ref F, @C.WithSelf.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc8_9.1: @C.WithSelf.G.%.loc8_9 (%.b5a) = impl_witness_access constants.%C.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc8_9.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %bound_method.loc8_9: <bound method> = bound_method %self.ref.loc8, %impl.elem0.loc8_9.1
// CHECK:STDOUT: %.loc8_12.1: %C.type = converted constants.%Self.as_type, constants.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %.loc8_12.2: %C.type = converted constants.%Self.as_type, constants.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %specific_impl_fn.loc8_9.1: <specific function> = specific_impl_function %impl.elem0.loc8_9.1, @C.WithSelf.F(constants.%Self) [symbolic = %specific_impl_fn.loc8_9.2 (constants.%specific_impl_fn)]
// CHECK:STDOUT: %bound_method.loc8_12: <bound method> = bound_method %self.ref.loc8, %specific_impl_fn.loc8_9.1
// CHECK:STDOUT: %C.WithSelf.F.call.loc8: init %empty_tuple.type = call %bound_method.loc8_12(%self.ref.loc8)
// CHECK:STDOUT: %self.ref.loc9: @C.WithSelf.G.%Self.as_type.loc6_8.1 (%Self.as_type) = name_ref self, %self
// CHECK:STDOUT: %impl.elem0.loc9: @C.WithSelf.G.%.loc8_9 (%.b5a) = impl_witness_access constants.%C.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc8_9.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %F.ref.loc9: @C.WithSelf.G.%.loc8_9 (%.b5a) = name_ref F, %impl.elem0.loc9 [symbolic = %impl.elem0.loc8_9.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %bound_method.loc9_9: <bound method> = bound_method %self.ref.loc9, %F.ref.loc9
// CHECK:STDOUT: %.loc9_14.1: %C.type = converted constants.%Self.as_type, constants.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %.loc9_14.2: %C.type = converted constants.%Self.as_type, constants.%Self [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %specific_impl_fn.loc9: <specific function> = specific_impl_function %F.ref.loc9, @C.WithSelf.F(constants.%Self) [symbolic = %specific_impl_fn.loc8_9.2 (constants.%specific_impl_fn)]
// CHECK:STDOUT: %bound_method.loc9_14: <bound method> = bound_method %self.ref.loc9, %specific_impl_fn.loc9
// CHECK:STDOUT: %C.WithSelf.F.call.loc9: init %empty_tuple.type = call %bound_method.loc9_14(%self.ref.loc9)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C.WithSelf(constants.%Self) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %C.WithSelf.F.type => constants.%C.WithSelf.F.type
// CHECK:STDOUT: %C.WithSelf.F => constants.%C.WithSelf.F
// CHECK:STDOUT: %C.WithSelf.G.type => constants.%C.WithSelf.G.type
// CHECK:STDOUT: %C.WithSelf.G => constants.%C.WithSelf.G
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C.WithSelf.G(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type.loc6_8.1 => constants.%Self.as_type
// CHECK:STDOUT: %pattern_type => constants.%pattern_type
// CHECK:STDOUT: %self.param_patt.loc6_8.2 => constants.%self.param_patt
// CHECK:STDOUT: %self.patt.loc6_8.2 => constants.%self.patt
// CHECK:STDOUT: }
// CHECK:STDOUT:
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