From: Jan Engelhardt <jengelh@inai.de>
Date: 2017-02-05 00:54:29.893127773 +0100

hlslGrammar.cpp:2333:44: warning: no return statement in function
returning non-void [-Wreturn-type]
   tFinalize& operator=(tFinalize&) { }

References: https://github.com/KhronosGroup/glslang/issues/718

diff --git a/hlsl/hlslGrammar.cpp b/hlsl/hlslGrammar.cpp
index 6c204137..bbb96f97 100755
--- a/hlsl/hlslGrammar.cpp
+++ b/hlsl/hlslGrammar.cpp
@@ -2330,7 +2330,7 @@ bool HlslGrammar::acceptPostfixExpression(TIntermTyped*& node)
         ~tFinalize() { parseContext.finalizeFlattening(); }
        HlslParseContext& parseContext;
     private:
-        tFinalize& operator=(tFinalize&) { }
+        tFinalize &operator=(tFinalize &) { return *this; }
     } finalize(parseContext);
 
     // Initialize the flattening accumulation data, so we can track data across multiple bracket or