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carbon-lang/toolchain/check/testdata/interface/fail_generic_redeclaration.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/none.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_generic_redeclaration.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/fail_generic_redeclaration.carbon
interface NotGeneric;
// CHECK:STDERR: fail_generic_redeclaration.carbon:[[@LINE+7]]:1: error: redeclaration differs because of parameter list [RedeclParamListDiffers]
// CHECK:STDERR: interface NotGeneric(T:! type) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_generic_redeclaration.carbon:[[@LINE-4]]:1: note: previously declared without parameter list [RedeclParamListPrevious]
// CHECK:STDERR: interface NotGeneric;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
interface NotGeneric(T:! type) {}
interface Generic(T:! type);
// CHECK:STDERR: fail_generic_redeclaration.carbon:[[@LINE+7]]:1: error: redeclaration differs because of missing parameter list [RedeclParamListDiffers]
// CHECK:STDERR: interface Generic {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_generic_redeclaration.carbon:[[@LINE-4]]:1: note: previously declared with parameter list [RedeclParamListPrevious]
// CHECK:STDERR: interface Generic(T:! type);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
interface Generic {}
interface DifferentParams(T:! type);
// CHECK:STDERR: fail_generic_redeclaration.carbon:[[@LINE+7]]:27: error: type `<pattern for ()>` of parameter 1 in redeclaration differs from previous parameter type `<pattern for type>` [RedeclParamDiffersType]
// CHECK:STDERR: interface DifferentParams(T:! ()) {}
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR: fail_generic_redeclaration.carbon:[[@LINE-4]]:27: note: previous declaration's corresponding parameter here [RedeclParamPrevious]
// CHECK:STDERR: interface DifferentParams(T:! type);
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
interface DifferentParams(T:! ()) {}
// CHECK:STDOUT: --- fail_generic_redeclaration.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %NotGeneric.type.fd5: type = facet_type <@NotGeneric.loc15> [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt.d47: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %NotGeneric.type.fec: type = generic_interface_type @NotGeneric.loc23 [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %NotGeneric.generic: %NotGeneric.type.fec = struct_value () [concrete]
// CHECK:STDOUT: %NotGeneric.type.e75: type = facet_type <@NotGeneric.loc23, @NotGeneric.loc23(%T.67d)> [symbolic]
// CHECK:STDOUT: %Self.b8f: %NotGeneric.type.e75 = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT: %Generic.type.30d: type = generic_interface_type @Generic.loc25 [concrete]
// CHECK:STDOUT: %Generic.generic: %Generic.type.30d = struct_value () [concrete]
// CHECK:STDOUT: %Generic.type.b2d: type = facet_type <@Generic.loc33> [concrete]
// CHECK:STDOUT: %Self.c53: %Generic.type.b2d = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %DifferentParams.type.998819.1: type = generic_interface_type @DifferentParams.loc35 [concrete]
// CHECK:STDOUT: %DifferentParams.generic.54c122.1: %DifferentParams.type.998819.1 = struct_value () [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: %T.patt.8f8: %pattern_type.cb1 = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.d5f: %empty_tuple.type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %DifferentParams.type.998819.2: type = generic_interface_type @DifferentParams.loc43 [concrete]
// CHECK:STDOUT: %DifferentParams.generic.54c122.2: %DifferentParams.type.998819.2 = struct_value () [concrete]
// CHECK:STDOUT: %DifferentParams.type.7d4: type = facet_type <@DifferentParams.loc43, @DifferentParams.loc43(%T.d5f)> [symbolic]
// CHECK:STDOUT: %Self.a37: %DifferentParams.type.7d4 = symbolic_binding Self, 1 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .NotGeneric = %NotGeneric.decl.loc15
// CHECK:STDOUT: .Generic = %Generic.decl.loc25
// CHECK:STDOUT: .DifferentParams = %DifferentParams.decl.loc35
// CHECK:STDOUT: }
// CHECK:STDOUT: %NotGeneric.decl.loc15: type = interface_decl @NotGeneric.loc15 [concrete = constants.%NotGeneric.type.fd5] {} {}
// CHECK:STDOUT: %NotGeneric.decl.loc23: %NotGeneric.type.fec = interface_decl @NotGeneric.loc23 [concrete = constants.%NotGeneric.generic] {
// CHECK:STDOUT: %T.patt.loc23_23.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc23_23.2 (constants.%T.patt.d47)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc23_26.1: type = splice_block %.loc23_26.2 [concrete = type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc23_26.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc23_23.2: type = symbolic_binding T, 0 [symbolic = %T.loc23_23.1 (constants.%T.67d)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Generic.decl.loc25: %Generic.type.30d = interface_decl @Generic.loc25 [concrete = constants.%Generic.generic] {
// CHECK:STDOUT: %T.patt.loc25_20.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc25_20.2 (constants.%T.patt.d47)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc25_23.1: type = splice_block %.loc25_23.2 [concrete = type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc25_23.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc25_20.2: type = symbolic_binding T, 0 [symbolic = %T.loc25_20.1 (constants.%T.67d)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Generic.decl.loc33: type = interface_decl @Generic.loc33 [concrete = constants.%Generic.type.b2d] {} {}
// CHECK:STDOUT: %DifferentParams.decl.loc35: %DifferentParams.type.998819.1 = interface_decl @DifferentParams.loc35 [concrete = constants.%DifferentParams.generic.54c122.1] {
// CHECK:STDOUT: %T.patt.loc35_28.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc35_28.2 (constants.%T.patt.d47)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc35_31.1: type = splice_block %.loc35_31.2 [concrete = type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc35_31.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc35_28.2: type = symbolic_binding T, 0 [symbolic = %T.loc35_28.1 (constants.%T.67d)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %DifferentParams.decl.loc43: %DifferentParams.type.998819.2 = interface_decl @DifferentParams.loc43 [concrete = constants.%DifferentParams.generic.54c122.2] {
// CHECK:STDOUT: %T.patt.loc43_28.1: %pattern_type.cb1 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc43_28.2 (constants.%T.patt.8f8)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc43_32.1: type = splice_block %.loc43_32.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc43_32.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc43_32.3: type = converted %.loc43_32.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc43_28.2: %empty_tuple.type = symbolic_binding T, 0 [symbolic = %T.loc43_28.1 (constants.%T.d5f)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @NotGeneric.loc15;
// CHECK:STDOUT:
// CHECK:STDOUT: generic interface @NotGeneric.loc23(%T.loc23_23.2: type) {
// CHECK:STDOUT: %T.patt.loc23_23.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc23_23.2 (constants.%T.patt.d47)]
// CHECK:STDOUT: %T.loc23_23.1: type = symbolic_binding T, 0 [symbolic = %T.loc23_23.1 (constants.%T.67d)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %NotGeneric.type: type = facet_type <@NotGeneric.loc23, @NotGeneric.loc23(%T.loc23_23.1)> [symbolic = %NotGeneric.type (constants.%NotGeneric.type.e75)]
// CHECK:STDOUT: %Self.loc23_32.2: @NotGeneric.loc23.%NotGeneric.type (%NotGeneric.type.e75) = symbolic_binding Self, 1 [symbolic = %Self.loc23_32.2 (constants.%Self.b8f)]
// CHECK:STDOUT:
// CHECK:STDOUT: interface {
// CHECK:STDOUT: %Self.loc23_32.1: @NotGeneric.loc23.%NotGeneric.type (%NotGeneric.type.e75) = symbolic_binding Self, 1 [symbolic = %Self.loc23_32.2 (constants.%Self.b8f)]
// CHECK:STDOUT: %NotGeneric.WithSelf.decl = interface_with_self_decl @NotGeneric.loc23 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc23_32.1
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic interface @Generic.loc25(%T.loc25_20.2: type) {
// CHECK:STDOUT: %T.patt.loc25_20.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc25_20.2 (constants.%T.patt.d47)]
// CHECK:STDOUT: %T.loc25_20.1: type = symbolic_binding T, 0 [symbolic = %T.loc25_20.1 (constants.%T.67d)]
// CHECK:STDOUT:
// CHECK:STDOUT: interface;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Generic.loc33 {
// CHECK:STDOUT: %Self: %Generic.type.b2d = symbolic_binding Self, 0 [symbolic = constants.%Self.c53]
// CHECK:STDOUT: %Generic.WithSelf.decl = interface_with_self_decl @Generic.loc33 [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 interface @DifferentParams.loc35(%T.loc35_28.2: type) {
// CHECK:STDOUT: %T.patt.loc35_28.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc35_28.2 (constants.%T.patt.d47)]
// CHECK:STDOUT: %T.loc35_28.1: type = symbolic_binding T, 0 [symbolic = %T.loc35_28.1 (constants.%T.67d)]
// CHECK:STDOUT:
// CHECK:STDOUT: interface;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic interface @DifferentParams.loc43(%T.loc43_28.2: %empty_tuple.type) {
// CHECK:STDOUT: %T.patt.loc43_28.2: %pattern_type.cb1 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc43_28.2 (constants.%T.patt.8f8)]
// CHECK:STDOUT: %T.loc43_28.1: %empty_tuple.type = symbolic_binding T, 0 [symbolic = %T.loc43_28.1 (constants.%T.d5f)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %DifferentParams.type: type = facet_type <@DifferentParams.loc43, @DifferentParams.loc43(%T.loc43_28.1)> [symbolic = %DifferentParams.type (constants.%DifferentParams.type.7d4)]
// CHECK:STDOUT: %Self.loc43_35.2: @DifferentParams.loc43.%DifferentParams.type (%DifferentParams.type.7d4) = symbolic_binding Self, 1 [symbolic = %Self.loc43_35.2 (constants.%Self.a37)]
// CHECK:STDOUT:
// CHECK:STDOUT: interface {
// CHECK:STDOUT: %Self.loc43_35.1: @DifferentParams.loc43.%DifferentParams.type (%DifferentParams.type.7d4) = symbolic_binding Self, 1 [symbolic = %Self.loc43_35.2 (constants.%Self.a37)]
// CHECK:STDOUT: %DifferentParams.WithSelf.decl = interface_with_self_decl @DifferentParams.loc43 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc43_35.1
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @NotGeneric.loc23(constants.%T.67d) {
// CHECK:STDOUT: %T.patt.loc23_23.2 => constants.%T.patt.d47
// CHECK:STDOUT: %T.loc23_23.1 => constants.%T.67d
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @NotGeneric.WithSelf(constants.%T.67d, constants.%Self.b8f) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Generic.loc25(constants.%T.67d) {
// CHECK:STDOUT: %T.patt.loc25_20.2 => constants.%T.patt.d47
// CHECK:STDOUT: %T.loc25_20.1 => constants.%T.67d
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Generic.WithSelf(constants.%Self.c53) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @DifferentParams.loc35(constants.%T.67d) {
// CHECK:STDOUT: %T.patt.loc35_28.2 => constants.%T.patt.d47
// CHECK:STDOUT: %T.loc35_28.1 => constants.%T.67d
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @DifferentParams.loc43(constants.%T.d5f) {
// CHECK:STDOUT: %T.patt.loc43_28.2 => constants.%T.patt.8f8
// CHECK:STDOUT: %T.loc43_28.1 => constants.%T.d5f
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @DifferentParams.WithSelf(constants.%T.d5f, constants.%Self.a37) {}
// CHECK:STDOUT:
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