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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/function/call/ref.carbon
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+4 -4
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@@ -86,11 +86,11 @@ fn F(x: i32);
fn G() {
var y: i32 = 0;
// CHECK:STDERR: fail_unnecessary_ref.carbon:[[@LINE+4]]:20: error: `ref` tag is not an argument to a `ref` parameter [RefTagNoRefParam]
// CHECK:STDERR: var z: (i32,) = (ref y,);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_unnecessary_ref.carbon:[[@LINE+4]]:27: error: `ref` tag is not an argument to a `ref` parameter [RefTagNoRefParam]
// CHECK:STDERR: var unused z: (i32,) = (ref y,);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
var z: (i32,) = (ref y,);
var unused z: (i32,) = (ref y,);
// CHECK:STDERR: fail_unnecessary_ref.carbon:[[@LINE+7]]:5: error: `ref` tag is not an argument to a `ref` parameter [RefTagNoRefParam]
// CHECK:STDERR: F(ref y);
// CHECK:STDERR: ^~~~~