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fdb188ccfd
Implementation of unused pattern bindings #2022, continued. Whereas previous PR #6460 took care of parsing, and PR #6479 prepared the stage by using _ in some test cases, this PR has the the actual implementation, using a simple dataflow analysis. --------- Co-authored-by: Burak Emir <bqe@google.com> Co-authored-by: jonmeow <jperkins@google.com>
44 lines
1.9 KiB
Plaintext
44 lines
1.9 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/impl/lookup/import_error.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/impl/lookup/import_error.carbon
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// --- fail_error_interface_z.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let X:! type;
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}
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// The value of .X is an error.
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// CHECK:STDERR: fail_error_interface_z.carbon:[[@LINE+4]]:35: error: associated constant `.(Z.X)` given two different values `{}` and `()` [AssociatedConstantWithDifferentValues]
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// CHECK:STDERR: final impl forall [T:! type] T as Z where .X = {} and .X = () {}
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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final impl forall [T:! type] T as Z where .X = {} and .X = () {}
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// --- fail_import_error.carbon
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library "[[@TEST_NAME]]";
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import library "error_interface_z";
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fn F[unused U:! type](T:! Z) {
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// The value of `.X` is an error. It should not crash though.
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//
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// CHECK:STDERR: fail_import_error.carbon:[[@LINE+7]]:23: error: cannot implicitly convert expression of type `()` to `T.(Z.X)` [ConversionFailure]
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// CHECK:STDERR: let unused a: T.X = ();
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// CHECK:STDERR: ^~
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// CHECK:STDERR: fail_import_error.carbon:[[@LINE+4]]:23: note: type `()` does not implement interface `Core.ImplicitAs(T.(Z.X))` [MissingImplInMemberAccessNote]
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// CHECK:STDERR: let unused a: T.X = ();
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// CHECK:STDERR: ^~
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// CHECK:STDERR:
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let unused a: T.X = ();
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}
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