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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/return.cpp
+3 -2
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@@ -73,7 +73,7 @@ static auto NoteReturnedVar(DiagnosticBuilder& diag,
auto RegisterReturnedVar(Context& context, Parse::NodeId returned_node,
Parse::NodeId type_node, SemIR::TypeId type_id,
SemIR::InstId bind_id) -> void {
SemIR::InstId bind_id, SemIR::NameId name_id) -> void {
auto& function = GetCurrentFunctionForReturn(context);
auto return_type_id = function.GetDeclaredReturnType(context.sem_ir());
@@ -111,7 +111,8 @@ auto RegisterReturnedVar(Context& context, Parse::NodeId returned_node,
diag.Emit();
}
auto existing_id = context.scope_stack().SetReturnedVarOrGetExisting(bind_id);
auto existing_id =
context.scope_stack().SetReturnedVarOrGetExisting(bind_id, name_id);
if (existing_id.has_value()) {
CARBON_DIAGNOSTIC(ReturnedVarShadowed, Error,
"cannot declare a `returned var` in the scope of "