Fixes an assertion while instantiating a template with an incomplete typo-corrected type.

Fixes PR35682. When a template in instantiated with an incomplete typo corrected type an assertion can trigger if the -ferror-limit is used to reduce the number of errors.

Patch by Mark de Wever.

llvm-svn: 371320

1 files changed, 6 insertions, 2 deletions

diff --git a/clang/lib/Sema/SemaTemplate.cpp b/clang/lib/Sema/SemaTemplate.cpp
index d7a1d9ea1b9..001e433ad6a 100644
--- a/clang/lib/Sema/SemaTemplate.cpp
+++ b/clang/lib/Sema/SemaTemplate.cpp
@@ -735,9 +735,13 @@ Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS,
                                 SourceLocation TemplateKWLoc,
                                 const DeclarationNameInfo &NameInfo,
                                 const TemplateArgumentListInfo *TemplateArgs) {
+  // DependentScopeDeclRefExpr::Create requires a valid QualifierLoc
+  NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context);
+  if (!QualifierLoc)
+    return ExprError();
+
   return DependentScopeDeclRefExpr::Create(
-      Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo,
-      TemplateArgs);
+      Context, QualifierLoc, TemplateKWLoc, NameInfo, TemplateArgs);
 }