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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>
26 lines
1.2 KiB
Plaintext
26 lines
1.2 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/primitives.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/patterns/unused_underscore.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/patterns/unused_underscore.carbon
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fn F() {
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// CHECK:STDERR: unused_underscore.carbon:[[@LINE+4]]:7: warning: `unused` modifier on pattern without bindings [UnusedPatternNoBindings]
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// CHECK:STDERR: var unused _: i32 = 1;
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// CHECK:STDERR: ^~~~~~~~~~~~~
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// CHECK:STDERR:
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var unused _: i32 = 1;
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// CHECK:STDERR: unused_underscore.carbon:[[@LINE+4]]:7: warning: `unused` modifier on pattern without bindings [UnusedPatternNoBindings]
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// CHECK:STDERR: let unused (_: i32, _: i32) = (1, 1);
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let unused (_: i32, _: i32) = (1, 1);
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}
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