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carbon-lang/toolchain/check/testdata/impl/error_recovery.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
//
// 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 [T: type] C as I {}
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
impl forall [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 U:! Z) {}
//@dump-sem-ir-begin
fn G(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 U:! Z) {}
//@dump-sem-ir-begin
fn G(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 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: %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: }
// 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: %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_7.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_7.2 (constants.%T.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc13_10.1: type = splice_block %.loc13_10.2 [concrete = type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc13_10.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc13_7.2: type = symbolic_binding T, 0 [symbolic = %T.loc13_7.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%T.loc13_7.2: type) {
// CHECK:STDOUT: %T.patt.loc13_7.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_7.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc13_7.1: type = symbolic_binding T, 0 [symbolic = %T.loc13_7.1 (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_7.1) [symbolic = %.loc19_6.2 (constants.%.7ae)]
// CHECK:STDOUT: %Z.lookup_impl_witness: <witness> = lookup_impl_witness %T.loc13_7.1, @Z [symbolic = %Z.lookup_impl_witness (constants.%Z.lookup_impl_witness)]
// CHECK:STDOUT: %Z.facet.loc19_6.2: %Z.type = facet_value %T.loc13_7.1, (%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_7.2 [symbolic = %T.loc13_7.1 (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_7.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc13_7.1 => 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: %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_7.1: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_7.2 (constants.%T.patt)]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc13_10.1: type = splice_block %.loc13_10.2 [concrete = type] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.loc13_10.2: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc13_7.2: type = symbolic_binding T, 0 [symbolic = %T.loc13_7.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @G(%T.loc13_7.2: type) {
// CHECK:STDOUT: %T.patt.loc13_7.2: %pattern_type.98f = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc13_7.2 (constants.%T.patt)]
// CHECK:STDOUT: %T.loc13_7.1: type = symbolic_binding T, 0 [symbolic = %T.loc13_7.1 (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_7.1) [symbolic = %.loc19_6.2 (constants.%.7ae)]
// CHECK:STDOUT: %Z.lookup_impl_witness: <witness> = lookup_impl_witness %T.loc13_7.1, @Z [symbolic = %Z.lookup_impl_witness (constants.%Z.lookup_impl_witness)]
// CHECK:STDOUT: %Z.facet.loc19_6.2: %Z.type = facet_value %T.loc13_7.1, (%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_7.2 [symbolic = %T.loc13_7.1 (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_7.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc13_7.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @G(constants.%empty_tuple.type) {
// CHECK:STDOUT: %T.patt.loc13_7.2 => constants.%T.patt
// CHECK:STDOUT: %T.loc13_7.1 => 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.39b: <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.39b) [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.39b) [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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