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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/enum/incomplete.carbon
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@@ -46,15 +46,15 @@ import Cpp library "declaration.h";
fn MyF() {
// TODO: It's a bit surprising to refer to this type as a class, even though
// we model it as a class in Carbon. Consider customizing the diagnostic.
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+8]]:10: error: binding pattern has incomplete type `UnsizedEnum` in name binding declaration [IncompleteTypeInBindingDecl]
// CHECK:STDERR: var e: Cpp.UnsizedEnum;
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+8]]:17: error: binding pattern has incomplete type `UnsizedEnum` in name binding declaration [IncompleteTypeInBindingDecl]
// CHECK:STDERR: var unused e: Cpp.UnsizedEnum;
// CHECK:STDERR: ^~~~~~~~~~~~~~~
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE-8]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./declaration.h:4:6: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: enum UnsizedEnum;
// CHECK:STDERR: ^
// CHECK:STDERR:
var e: Cpp.UnsizedEnum;
var unused e: Cpp.UnsizedEnum;
}
// CHECK:STDOUT: --- import_declaration.carbon