================
@@ -3876,6 +3864,41 @@ TemplateDeductionResult
Sema::FinishTemplateArgumentDeduction(
FD = const_cast<FunctionDecl *>(FDFriend);
Owner = FD->getLexicalDeclContext();
}
+
+ // C++20 [temp.deduct.general]p5: [DR2369]
+ // If the function template has associated constraints, those constraints are
+ // checked for satisfaction. If the constraints are not satisfied, type
+ // deduction fails.
+ bool NeedConstraintChecking =
+ !PartialOverloading ||
+ CanonicalBuilder.size() ==
+ FunctionTemplate->getTemplateParameters()->size();
+ // FIXME: We haven't implemented DR2369 for lambdas yet, because we need
+ // the captured variables to be instantiated in the scope.
+ bool IsLambda = isLambdaCallOperator(FD) || isLambdaConversionOperator(FD);
+ if (!IsLambda && NeedConstraintChecking) {
+ if (CheckFunctionConstraintsWithoutInstantiation(
+ Info.getLocation(), FunctionTemplate->getCanonicalDecl(),
+ CanonicalBuilder, Info.AssociatedConstraintsSatisfaction))
+ return TemplateDeductionResult::MiscellaneousDeductionFailure;
+ if (!Info.AssociatedConstraintsSatisfaction.IsSatisfied) {
+ Info.reset(Info.takeSugared(),
+ TemplateArgumentList::CreateCopy(Context, CanonicalBuilder));
+ return TemplateDeductionResult::ConstraintsNotSatisfied;
+ }
+ }
+ // C++ [temp.deduct.call]p10: [DR1391]
----------------
cor3ntin wrote:
```suggestion
// C++ [temp.deduct.call]p10 (CWG1391):
```
https://github.com/llvm/llvm-project/pull/102857
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