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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
6fe9db297d
A binding can have a constant value that is an `ErrorInst` during error recovery. In that case, deduction would crash when attempting to diagnose that the binding had no deduced value.
63 lines
2.1 KiB
Plaintext
63 lines
2.1 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/deduce/binding_pattern.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/deduce/binding_pattern.carbon
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// --- fail_incompatible_deduce.carbon
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library "[[@TEST_NAME]]";
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class C(T:! type) {
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fn Create(unused value: T) {}
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}
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fn F(unused U:! type, V:! type) {
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// CHECK:STDERR: fail_incompatible_deduce.carbon:[[@LINE+10]]:15: error: cannot implicitly convert expression of type `{}` to `V` [ConversionFailure]
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// CHECK:STDERR: C(V).Create({});
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// CHECK:STDERR: ^~
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// CHECK:STDERR: fail_incompatible_deduce.carbon:[[@LINE+7]]:15: note: type `{}` does not implement interface `Core.ImplicitAs(V)` [MissingImplInMemberAccessInContext]
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// CHECK:STDERR: C(V).Create({});
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// CHECK:STDERR: ^~
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// CHECK:STDERR: fail_incompatible_deduce.carbon:[[@LINE-10]]:20: note: initializing function parameter [InCallToFunctionParam]
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// CHECK:STDERR: fn Create(unused value: T) {}
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR:
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C(V).Create({});
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}
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// --- compatible_deduce.carbon
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library "[[@TEST_NAME]]";
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class C(T:! type) {
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fn Create(unused value: T) {}
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}
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// This `where` is sufficient to say that `{} as V` works.
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fn F(unused U:! type, V:! Core.Destroy where {} impls Core.ImplicitAs(.Self)) {
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C(V).Create({});
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}
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// --- fail_invalid_type.carbon
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library "[[@TEST_NAME]]";
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class A {};
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// CHECK:STDERR: fail_invalid_type.carbon:[[@LINE+4]]:10: error: name `DoesNotExist` not found [NameNotFound]
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// CHECK:STDERR: fn F[T:! DoesNotExist](unused x: T) {}
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// CHECK:STDERR: ^~~~~~~~~~~~
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// CHECK:STDERR:
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fn F[T:! DoesNotExist](unused x: T) {}
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fn Call(a: A) {
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F(a);
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}
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