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carbon-lang/toolchain/check/testdata/impl/error_recovery.carbon
T
Christopher Di BellaandRichard Smith 4ea5ef45dd Skip ImplWitnessTable::elements_id when generating fingerprints (#7629) 
Implementing interface modifiers causes an infinite loop when generating
fingerprints because the witness value generates a fingerprint that's
dependent on something dependent on the witness value. We've debugged
this to the witness table's `elements_id` field.

This hack is a workaround for creating a new block type whose value is
not codependent with its identity.

Co-authored-by: Richard Smith <richard@metafoo.co.uk>

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-08-11 22:39:30 +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/impl/error_recovery.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/error_recovery.carbon
// --- fail_runtime_generic_param.carbon
library "[[@TEST_NAME]]";
class C {}
interface I {}
//@dump-sem-ir-begin
// CHECK:STDERR: fail_runtime_generic_param.carbon:[[@LINE+4]]:14: error: parameters of generic types must be constant [GenericParamMustBeConstant]
// CHECK:STDERR: impl forall [runtime T: type] C as I {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR:
impl forall [runtime T: type] C as I {}
//@dump-sem-ir-end
// --- fail_nonfinal_lookup_impl_witness_error_in_import.carbon
library "[[@TEST_NAME]]";
interface Z {}
// CHECK:STDERR: fail_nonfinal_lookup_impl_witness_error_in_import.carbon:[[@LINE+4]]:1: error: impl declared but not defined [ImplMissingDefinition]
// CHECK:STDERR: impl forall [T: type] T as Z;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
impl forall [T: type] T as Z;
fn F(unused generic U: Z) {}
//@dump-sem-ir-begin
fn G(generic T: type) {
// This makes a LookupImplWitness instruction, but future lookups (evaluation
// of this instruction with a specific) will result in an error since the impl
// is never defined and is left with an error as its witness at the end of the
// file. The lookups should not fail entirely, just result in an error
// witness.
F(T);
}
//@dump-sem-ir-end
// --- nonfinal_lookup_impl_witness_error_in_import.impl.carbon
impl library "[[@TEST_NAME]]";
fn H() {
// The specific here contains errors, but does not fail entirely and crash
// when resolving the LookupImplWitness.
G(());
}
// --- fail_nonfinal_lookup_impl_witness_error.carbon
library "[[@TEST_NAME]]";
interface Z {}
// CHECK:STDERR: fail_nonfinal_lookup_impl_witness_error.carbon:[[@LINE+4]]:1: error: impl declared but not defined [ImplMissingDefinition]
// CHECK:STDERR: impl forall [T: type] T as Z;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
impl forall [T: type] T as Z;
fn F(unused generic U: Z) {}
//@dump-sem-ir-begin
fn G(generic T: type) {
// This makes a LookupImplWitness instruction, but future lookups (evaluation
// of this instruction with a specific) will fail with an error since the impl
// is never defined and is left with an error as its witness at the end of the
// file. The lookups should not fail entirely, just result in an error
// witness.
F(T);
}
//@dump-sem-ir-end
fn H() {
// The specific here contains errors, but does not fail entirely and crash
// when resolving the LookupImplWitness.
G(());
}
// --- fail_final_lookup_impl_witness_error.carbon
library "[[@TEST_NAME]]";
interface Z {}
// CHECK:STDERR: fail_final_lookup_impl_witness_error.carbon:[[@LINE+4]]:1: error: impl declared but not defined [ImplMissingDefinition]
// CHECK:STDERR: impl forall [T: type] T as Z;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
impl forall [T: type] T as Z;
fn F(unused generic U: Z) {}
fn G() {
// This impl lookup resolves to a final witness, which poisons any future
// queries. At the end of the file, the poisoned queries are replayed to make
// sure they don't change. However, here it is changed by the impl being
// diagnosed with an error. The poisoning check should handle that gracefully.
//@dump-sem-ir-begin
F(());
//@dump-sem-ir-end
}
// --- fail_invalid_fn_syntax_in_impl.carbon
library "[[@TEST_NAME]]";
interface I {
fn Op(self);
}
class C {};
//@dump-sem-ir-begin
impl C as I {
// This leaves the impl with a placeholder instruction in the witness table.
// CHECK:STDERR: fail_invalid_fn_syntax_in_impl.carbon:[[@LINE+12]]:9: error: name `x` not found [NameNotFound]
// CHECK:STDERR: fn Op[x self: C]() {}
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_fn_syntax_in_impl.carbon:[[@LINE+8]]:11: error: expected `,` or `]` [UnexpectedTokenAfterListElement]
// CHECK:STDERR: fn Op[x self: C]() {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_fn_syntax_in_impl.carbon:[[@LINE+4]]:8: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR: fn Op[x self: C]() {}
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
fn Op[x self: C]() {}
}
//@dump-sem-ir-end
// CHECK:STDOUT: --- fail_runtime_generic_param.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %.b7f: <witness> = impl_self_witness %C, @I [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @C.as.I.impl.%I.impl_witness_table [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: impl_decl @C.as.I.impl [concrete] {} {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc11: <witness> = impl_self_witness @C.as.I.impl.%C.ref, @I [concrete = constants.%.b7f]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl: %C.ref as %I.ref {
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (), @C.as.I.impl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend %I.ref
// CHECK:STDOUT: witness = %I.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_nonfinal_lookup_impl_witness_error_in_import.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %Z.lookup_impl_witness: <witness> = lookup_impl_witness %T, @Z [symbolic]
// CHECK:STDOUT: %.7ae: require_specific_def_type = require_specific_def @T.as.Z.impl(%T) [symbolic]
// CHECK:STDOUT: %Z.facet: %Z.type = facet_value %T, (%Z.lookup_impl_witness) [symbolic]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F, @F(%Z.facet) [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %T.patt.loc13_15.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_15.2 (constants.%T.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc13_17.1: type = splice_block %.loc13_17.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc13_17.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc13_15.2: type = symbolic_binding T, 0 [symbolic = %T.loc13_15.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%T.loc13_15.2: type) {
// CHECK:STDOUT: %T.patt.loc13_15.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_15.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc13_15.1: type = symbolic_binding T, 0 [symbolic = %T.loc13_15.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %.loc19_6.2: require_specific_def_type = require_specific_def @T.as.Z.impl(%T.loc13_15.1) [symbolic = %.loc19_6.2 (constants.%.7ae)]
// CHECK:STDOUT: %Z.lookup_impl_witness: <witness> = lookup_impl_witness %T.loc13_15.1, @Z [symbolic = %Z.lookup_impl_witness (constants.%Z.lookup_impl_witness)]
// CHECK:STDOUT: %Z.facet.loc19_6.2: %Z.type = facet_value %T.loc13_15.1, (%Z.lookup_impl_witness) [symbolic = %Z.facet.loc19_6.2 (constants.%Z.facet)]
// CHECK:STDOUT: %F.specific_fn.loc19_3.2: <specific function> = specific_function constants.%F, @F(%Z.facet.loc19_6.2) [symbolic = %F.specific_fn.loc19_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %T.ref: type = name_ref T, %T.loc13_15.2 [symbolic = %T.loc13_15.1 (constants.%T)]
// CHECK:STDOUT: %Z.facet.loc19_6.1: %Z.type = facet_value %T.ref, (constants.%Z.lookup_impl_witness) [symbolic = %Z.facet.loc19_6.2 (constants.%Z.facet)]
// CHECK:STDOUT: %.loc19_6.1: %Z.type = converted %T.ref, %Z.facet.loc19_6.1 [symbolic = %Z.facet.loc19_6.2 (constants.%Z.facet)]
// CHECK:STDOUT: %F.specific_fn.loc19_3.1: <specific function> = specific_function %F.ref, @F(constants.%Z.facet) [symbolic = %F.specific_fn.loc19_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.specific_fn.loc19_3.1()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%T) {
// CHECK:STDOUT: %T.patt.loc13_15.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc13_15.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_nonfinal_lookup_impl_witness_error.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %pattern_type.98f: type = pattern_type type [concrete]
// CHECK:STDOUT: %T.patt: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %Z.lookup_impl_witness: <witness> = lookup_impl_witness %T, @Z [symbolic]
// CHECK:STDOUT: %.7ae: require_specific_def_type = require_specific_def @T.as.Z.impl(%T) [symbolic]
// CHECK:STDOUT: %Z.facet: %Z.type = facet_value %T, (%Z.lookup_impl_witness) [symbolic]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F, @F(%Z.facet) [symbolic]
// CHECK:STDOUT: %.d12: require_specific_def_type = require_specific_def @T.as.Z.impl(%empty_tuple.type) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %T.patt.loc13_15.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_15.2 (constants.%T.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc13_17.1: type = splice_block %.loc13_17.2 [concrete = type] {
// CHECK:STDOUT: %.Self.frozen: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc13_17.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc13_15.2: type = symbolic_binding T, 0 [symbolic = %T.loc13_15.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%T.loc13_15.2: type) {
// CHECK:STDOUT: %T.patt.loc13_15.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_15.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc13_15.1: type = symbolic_binding T, 0 [symbolic = %T.loc13_15.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %.loc19_6.2: require_specific_def_type = require_specific_def @T.as.Z.impl(%T.loc13_15.1) [symbolic = %.loc19_6.2 (constants.%.7ae)]
// CHECK:STDOUT: %Z.lookup_impl_witness: <witness> = lookup_impl_witness %T.loc13_15.1, @Z [symbolic = %Z.lookup_impl_witness (constants.%Z.lookup_impl_witness)]
// CHECK:STDOUT: %Z.facet.loc19_6.2: %Z.type = facet_value %T.loc13_15.1, (%Z.lookup_impl_witness) [symbolic = %Z.facet.loc19_6.2 (constants.%Z.facet)]
// CHECK:STDOUT: %F.specific_fn.loc19_3.2: <specific function> = specific_function constants.%F, @F(%Z.facet.loc19_6.2) [symbolic = %F.specific_fn.loc19_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %T.ref: type = name_ref T, %T.loc13_15.2 [symbolic = %T.loc13_15.1 (constants.%T)]
// CHECK:STDOUT: %Z.facet.loc19_6.1: %Z.type = facet_value %T.ref, (constants.%Z.lookup_impl_witness) [symbolic = %Z.facet.loc19_6.2 (constants.%Z.facet)]
// CHECK:STDOUT: %.loc19_6.1: %Z.type = converted %T.ref, %Z.facet.loc19_6.1 [symbolic = %Z.facet.loc19_6.2 (constants.%Z.facet)]
// CHECK:STDOUT: %F.specific_fn.loc19_3.1: <specific function> = specific_function %F.ref, @F(constants.%Z.facet) [symbolic = %F.specific_fn.loc19_3.2 (constants.%F.specific_fn)]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.specific_fn.loc19_3.1()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%T) {
// CHECK:STDOUT: %T.patt.loc13_15.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc13_15.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%empty_tuple.type) {
// CHECK:STDOUT: %T.patt.loc13_15.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc13_15.1 => constants.%empty_tuple.type
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %.loc19_6.2 => constants.%.d12
// CHECK:STDOUT: %Z.lookup_impl_witness => <error>
// CHECK:STDOUT: %Z.facet.loc19_6.2 => <error>
// CHECK:STDOUT: %F.specific_fn.loc19_3.2 => <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_final_lookup_impl_witness_error.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Z.type: type = facet_type <@Z> [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %Z.impl_witness.55c: <witness> = impl_witness @T.as.Z.impl.%Z.impl_witness_table, @T.as.Z.impl(%empty_tuple.type) [concrete]
// CHECK:STDOUT: %Z.facet: %Z.type = facet_value %empty_tuple.type, (%Z.impl_witness.55c) [concrete]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F, @F(%Z.facet) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %F.ref: %F.type = name_ref F, file.%F.decl [concrete = constants.%F]
// CHECK:STDOUT: %.loc18_6: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %Z.facet: %Z.type = facet_value constants.%empty_tuple.type, (constants.%Z.impl_witness.55c) [concrete = constants.%Z.facet]
// CHECK:STDOUT: %.loc18_7: %Z.type = converted %.loc18_6, %Z.facet [concrete = constants.%Z.facet]
// CHECK:STDOUT: %F.specific_fn: <specific function> = specific_function %F.ref, @F(constants.%Z.facet) [concrete = constants.%F.specific_fn]
// CHECK:STDOUT: %F.call: init %empty_tuple.type = call %F.specific_fn()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_invalid_fn_syntax_in_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: impl @<null name>: <unexpected>.inst{{[0-9A-F]+}}.loc9_6 as <unexpected>.inst{{[0-9A-F]+}}.loc9_11;
// CHECK:STDOUT:
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