Merge pull request #2849 from jeremy-lunarg/hayes-fix-issue-2848

Fix seg fault

Test/baseResults/noMatchingFunction.frag.out

@@ -0,0 +1,52 @@
+noMatchingFunction.frag
+ERROR: 0:17: 'func' : no matching overloaded function found 
+ERROR: 1 compilation errors.  No code generated.
+
+
+Shader version: 330
+ERROR: node is still EOpNull!
+0:8  Function Definition: func(struct-S-f11; ( global float)
+0:8    Function Parameters: 
+0:8      's' ( in structure{ global float a})
+0:10    Sequence
+0:10      Branch: Return with expression
+0:10        a: direct index for structure ( global float)
+0:10          's' ( in structure{ global float a})
+0:10          Constant:
+0:10            0 (const int)
+0:15  Function Definition: main( ( global void)
+0:15    Function Parameters: 
+0:17    Sequence
+0:17      Sequence
+0:17        move second child to first child ( temp float)
+0:17          'c' ( temp float)
+0:17          Constant:
+0:17            0.000000
+0:18      move second child to first child ( temp 4-component vector of float)
+0:18        'o_color' (layout( location=0) out 4-component vector of float)
+0:18        Construct vec4 ( temp 4-component vector of float)
+0:18          'c' ( temp float)
+0:?   Linker Objects
+0:?     'o_color' (layout( location=0) out 4-component vector of float)
+
+
+Linked fragment stage:
+
+
+Shader version: 330
+ERROR: node is still EOpNull!
+0:15  Function Definition: main( ( global void)
+0:15    Function Parameters: 
+0:17    Sequence
+0:17      Sequence
+0:17        move second child to first child ( temp float)
+0:17          'c' ( temp float)
+0:17          Constant:
+0:17            0.000000
+0:18      move second child to first child ( temp 4-component vector of float)
+0:18        'o_color' (layout( location=0) out 4-component vector of float)
+0:18        Construct vec4 ( temp 4-component vector of float)
+0:18          'c' ( temp float)
+0:?   Linker Objects
+0:?     'o_color' (layout( location=0) out 4-component vector of float)
+

Test/noMatchingFunction.frag

@@ -0,0 +1,19 @@
+#version 330
+
+struct S
+{
+	float a;
+};
+
+float func(S s)
+{
+	return s.a;
+}
+
+layout(location = 0) out vec4 o_color;
+
+void main()
+{
+	float c = func(1.0f); // ERROR: no matching function
+	o_color = vec4(c);
+}