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Add support for ->? return forms (#6849)

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This includes checking and lowering for concrete form literals. Support
for symbolic forms is future work.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Geoff Romer
2026-03-09 22:30:16 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent 5ad9b1a35d
commit 18cfeb7476
19 changed files with 574 additions and 75 deletions
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toolchain/check/cpp/import.cpp
+3 -5
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@@ -1364,27 +1364,25 @@ static auto CreateFunctionSignatureInsts(
Context& context, SemIR::LocId loc_id, clang::FunctionDecl* clang_decl,
SemIR::ClangDeclKey::Signature signature)
-> std::optional<FunctionSignatureInsts> {
context.full_pattern_stack().PushFullPattern(
FullPatternStack::Kind::ImplicitParamList);
std::optional pop = llvm::scope_exit(
[&context] { context.full_pattern_stack().PopFullPattern(); });
context.full_pattern_stack().StartImplicitParamList();
auto implicit_param_patterns_id =
MakeImplicitParamPatternsBlockId(context, loc_id, *clang_decl);
if (!implicit_param_patterns_id.has_value()) {
return std::nullopt;
}
context.full_pattern_stack().EndImplicitParamList();
context.full_pattern_stack().StartExplicitParamList();
auto param_patterns_id =
MakeParamPatternsBlockId(context, loc_id, *clang_decl, signature);
if (!param_patterns_id.has_value()) {
return std::nullopt;
}
context.full_pattern_stack().EndExplicitParamList();
auto [return_type_inst_id, return_form_inst_id, return_patterns_id] =
GetReturnInfo(context, loc_id, clang_decl);
if (return_type_inst_id == SemIR::ErrorInst::TypeInstId) {
return std::nullopt;
}
pop.reset();
auto match_results =
CalleePatternMatch(context, implicit_param_patterns_id, param_patterns_id,