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Implement unused pattern bindings, continued (#6518)

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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>
This commit is contained in:
Burak Emir
2026-02-19 23:33:36 +00:00
committed by GitHub
co-authored by Burak Emir jonmeow
parent bea24a8bee
commit fdb188ccfd
366 changed files with 8453 additions and 7996 deletions
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toolchain/check/testdata/patterns/unused_underscore.carbon
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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/primitives.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/patterns/unused_underscore.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/patterns/unused_underscore.carbon
fn F() {
// CHECK:STDERR: unused_underscore.carbon:[[@LINE+4]]:7: warning: `unused` modifier on pattern without bindings [UnusedPatternNoBindings]
// CHECK:STDERR: var unused _: i32 = 1;
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR:
var unused _: i32 = 1;
// CHECK:STDERR: unused_underscore.carbon:[[@LINE+4]]:7: warning: `unused` modifier on pattern without bindings [UnusedPatternNoBindings]
// CHECK:STDERR: let unused (_: i32, _: i32) = (1, 1);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
let unused (_: i32, _: i32) = (1, 1);
}