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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/interop/cpp/import.carbon
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+5 -5
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@@ -38,11 +38,11 @@ import library "namespace_api";
fn F() {
// Imports are not implicitly re-exported, so lookup is expected to fail.
// CHECK:STDERR: fail_import_namespace_api.carbon:[[@LINE+4]]:10: error: member name `MyClass` not found in `Cpp.MyNamespace` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: var x: MyNamespaceAlias.MyClass;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_import_namespace_api.carbon:[[@LINE+4]]:17: error: member name `MyClass` not found in `Cpp.MyNamespace` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: var unused x: MyNamespaceAlias.MyClass;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var x: MyNamespaceAlias.MyClass;
var unused x: MyNamespaceAlias.MyClass;
}
// ============================================================================
@@ -126,7 +126,7 @@ library "[[@TEST_NAME]]";
import Cpp;
fn F(input: Cpp.int) {
let output: i32 = input;
let unused output: i32 = input;
}
// ============================================================================