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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/driver/testdata/fail_flush_errors.carbon
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@@ -37,7 +37,7 @@ fn F() {
undeclared2;
// Add the name into the string table via a declaration rather than an expression.
if (true) { let undeclared3: () = (); }
if (true) { let unused undeclared3: () = (); }
// CHECK:STDERR: fail_flush_errors.carbon:[[@LINE+4]]:3: error: name `undeclared3` not found [NameNotFound]
// CHECK:STDERR: undeclared3;
// CHECK:STDERR: ^~~~~~~~~~~