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carbon-lang/toolchain/check/testdata/interface/fail_member_lookup.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
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/fail_member_lookup.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/fail_member_lookup.carbon
// --- fail_member_lookup.carbon
library "[[@TEST_NAME]]";
interface Interface {
fn F();
let T:! type;
}
fn F() {
// CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:3: error: value of type `<associated entity in Interface>` is not callable [CallToNonCallable]
// CHECK:STDERR: Interface.F();
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
Interface.F();
// CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+7]]:17: error: cannot implicitly convert non-type value of type `<associated entity in Interface>` to `type` [ConversionFailureNonTypeToFacet]
// CHECK:STDERR: var unused v: Interface.T;
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:17: note: type `<associated entity in Interface>` does not implement interface `Core.ImplicitAs(type)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused v: Interface.T;
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
var unused v: Interface.T;
}
interface Different {}
// CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:24: error: cannot convert type `U` that implements `Different` into type implementing `Interface` [ConversionFailureFacetToFacet]
// CHECK:STDERR: fn G(U:! Different) -> U.(Interface.T);
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR:
fn G(U:! Different) -> U.(Interface.T);
// CHECK:STDOUT: --- fail_member_lookup.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Interface.type: type = facet_type <@Interface> [concrete]
// CHECK:STDOUT: %Self.3ce: %Interface.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F.type: type = fn_type @Interface.WithSelf.F, @Interface.WithSelf(%Self.3ce) [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F: %Interface.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %Interface.assoc_type: type = assoc_entity_type @Interface [concrete]
// CHECK:STDOUT: %assoc0.baa: %Interface.assoc_type = assoc_entity element0, @Interface.WithSelf.%Interface.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %assoc1: %Interface.assoc_type = assoc_entity element1, @Interface.WithSelf.%T [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %ImplicitAs.type.0ff: type = generic_interface_type @ImplicitAs [concrete]
// CHECK:STDOUT: %ImplicitAs.generic: %ImplicitAs.type.0ff = struct_value () [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %Different.type: type = facet_type <@Different> [concrete]
// CHECK:STDOUT: %Self.8ba: %Different.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.776: type = pattern_type %Different.type [concrete]
// CHECK:STDOUT: %U.patt: %pattern_type.776 = symbolic_binding_pattern U, 0 [symbolic]
// CHECK:STDOUT: %U: %Different.type = symbolic_binding U, 0 [symbolic]
// CHECK:STDOUT: %U.as_type: type = facet_access_type %U [symbolic]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .ImplicitAs = %Core.ImplicitAs
// CHECK:STDOUT: .Destroy = %Core.Destroy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.ImplicitAs: %ImplicitAs.type.0ff = import_ref Core//prelude/parts/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
// CHECK:STDOUT: %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Interface = %Interface.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: .Different = %Different.decl
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Interface.decl: type = interface_decl @Interface [concrete = constants.%Interface.type] {} {}
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {} {}
// CHECK:STDOUT: %Different.decl: type = interface_decl @Different [concrete = constants.%Different.type] {} {}
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %U.patt.loc32_7.1: %pattern_type.776 = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc32_7.2 (constants.%U.patt)]
// CHECK:STDOUT: %return.patt: <error> = return_slot_pattern <error>, <error> [concrete = <error>]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %U.ref: %Different.type = name_ref U, %U.loc32_7.2 [symbolic = %U.loc32_7.1 (constants.%U)]
// CHECK:STDOUT: %Interface.ref: type = name_ref Interface, file.%Interface.decl [concrete = constants.%Interface.type]
// CHECK:STDOUT: %T.ref: %Interface.assoc_type = name_ref T, @T.%assoc1 [concrete = constants.%assoc1]
// CHECK:STDOUT: %U.as_type.loc32_25.2: type = facet_access_type %U.ref [symbolic = %U.as_type.loc32_25.1 (constants.%U.as_type)]
// CHECK:STDOUT: %.loc32: type = splice_block %Different.ref [concrete = constants.%Different.type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %Different.ref: type = name_ref Different, file.%Different.decl [concrete = constants.%Different.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %U.loc32_7.2: %Different.type = symbolic_binding U, 0 [symbolic = %U.loc32_7.1 (constants.%U)]
// CHECK:STDOUT: %return: <error> = return_slot <error>
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface {
// CHECK:STDOUT: %Self: %Interface.type = symbolic_binding Self, 0 [symbolic = constants.%Self.3ce]
// CHECK:STDOUT: %Interface.WithSelf.decl = interface_with_self_decl @Interface [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %Interface.WithSelf.F.decl: @Interface.WithSelf.%Interface.WithSelf.F.type (%Interface.WithSelf.F.type) = fn_decl @Interface.WithSelf.F [symbolic = @Interface.WithSelf.%Interface.WithSelf.F (constants.%Interface.WithSelf.F)] {} {}
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, %Interface.WithSelf.F.decl [concrete = constants.%assoc0.baa]
// CHECK:STDOUT: %T: type = assoc_const_decl @T [concrete] {
// CHECK:STDOUT: %assoc1: %Interface.assoc_type = assoc_entity element1, @Interface.WithSelf.%T [concrete = constants.%assoc1]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @Interface.WithSelf.%assoc0
// CHECK:STDOUT: .T = @T.%assoc1
// CHECK:STDOUT: witness = (@Interface.WithSelf.%Interface.WithSelf.F.decl, @Interface.WithSelf.%T)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Different {
// CHECK:STDOUT: %Self: %Different.type = symbolic_binding Self, 0 [symbolic = constants.%Self.8ba]
// CHECK:STDOUT: %Different.WithSelf.decl = interface_with_self_decl @Different [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Interface.WithSelf.F(@Interface.%Self: %Interface.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Interface.ref.loc14: type = name_ref Interface, file.%Interface.decl [concrete = constants.%Interface.type]
// CHECK:STDOUT: %F.ref: %Interface.assoc_type = name_ref F, @Interface.WithSelf.%assoc0 [concrete = constants.%assoc0.baa]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: <error> = ref_binding_pattern v [concrete = <error>]
// CHECK:STDOUT: %v.var_patt: <error> = var_pattern %v.patt [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref <error> = var %v.var_patt [concrete = <error>]
// CHECK:STDOUT: assign %v.var, <error>
// CHECK:STDOUT: %.1: <error> = splice_block <error> [concrete = <error>] {
// CHECK:STDOUT: %Interface.ref.loc23: type = name_ref Interface, file.%Interface.decl [concrete = constants.%Interface.type]
// CHECK:STDOUT: %T.ref: %Interface.assoc_type = name_ref T, @T.%assoc1 [concrete = constants.%assoc1]
// CHECK:STDOUT: %.loc23: type = converted %T.ref, <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v: ref <error> = ref_binding v, <error> [concrete = <error>]
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%U.loc32_7.2: %Different.type) {
// CHECK:STDOUT: %U.patt.loc32_7.2: %pattern_type.776 = symbolic_binding_pattern U, 0 [symbolic = %U.patt.loc32_7.2 (constants.%U.patt)]
// CHECK:STDOUT: %U.loc32_7.1: %Different.type = symbolic_binding U, 0 [symbolic = %U.loc32_7.1 (constants.%U)]
// CHECK:STDOUT: %U.as_type.loc32_25.1: type = facet_access_type %U.loc32_7.1 [symbolic = %U.as_type.loc32_25.1 (constants.%U.as_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() -> <error>;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf(constants.%Self.3ce) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self.3ce
// CHECK:STDOUT: %Interface.WithSelf.F.type => constants.%Interface.WithSelf.F.type
// CHECK:STDOUT: %Interface.WithSelf.F => constants.%Interface.WithSelf.F
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.F(constants.%Self.3ce) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Different.WithSelf(constants.%Self.8ba) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%U) {
// CHECK:STDOUT: %U.patt.loc32_7.2 => constants.%U.patt
// CHECK:STDOUT: %U.loc32_7.1 => constants.%U
// CHECK:STDOUT: %U.as_type.loc32_25.1 => constants.%U.as_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
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