1 files changed, 4 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 1a80283f826..e8b4d8cb4b3 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -2181,6 +2181,10 @@ inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1
     Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue,
          lex->getSourceRange());
     return QualType();
+  case Expr::MLV_NotBlockQualified:
+    Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue,
+         lex->getSourceRange());
+    return QualType();
   }
 
   AssignConvertType ConvTy;