Fix to PR12262 - assertion when substituting explicit template arguments
does not substitute a sizeof-pack expression.
The solution is proposed by Richard Smith.
Differential Revision: http://llvm-reviews.chandlerc.com/D869
llvm-svn: 186306
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 14185c3..420ccb1 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -3588,6 +3588,13 @@
return cast<NamedDecl>((*Found->get<DeclArgumentPack *>())[PackIdx]);
}
+ // If we're performing a partial substitution during template argument
+ // deduction, we may not have values for template parameters yet. They
+ // just map to themselves.
+ if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
+ isa<TemplateTemplateParmDecl>(D))
+ return D;
+
// If we didn't find the decl, then we must have a label decl that hasn't
// been found yet. Lazily instantiate it and return it now.
assert(isa<LabelDecl>(D));