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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/void.carbon
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@@ -18,7 +18,7 @@ import Cpp;
// This is valid, unlike in C++, because `Cpp.void` is complete but abstract in
// Carbon. Values of type `Cpp.void` exist, but objects of that type do not.
fn F(x: Cpp.void) {}
fn F(unused x: Cpp.void) {}
// --- fail_void_abstract.carbon
@@ -27,14 +27,14 @@ library "[[@TEST_NAME]]";
import Cpp;
fn G() {
// CHECK:STDERR: fail_void_abstract.carbon:[[@LINE+7]]:10: error: binding pattern has abstract type `Cpp.void` in `var` pattern [AbstractTypeInVarPattern]
// CHECK:STDERR: var x: Cpp.void;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_void_abstract.carbon:[[@LINE+7]]:17: error: binding pattern has abstract type `Cpp.void` in `var` pattern [AbstractTypeInVarPattern]
// CHECK:STDERR: var unused x: Cpp.void;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: {{.*}}/prelude/types/cpp/void.carbon:24:1: note: class was declared abstract here [ClassAbstractHere]
// CHECK:STDERR: abstract class CppCompat.VoidBase {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var x: Cpp.void;
var unused x: Cpp.void;
}
// --- fail_void_argument.carbon