Don't try to swizzle void.
diff --git a/gtests/AST.FromFile.cpp b/gtests/AST.FromFile.cpp
index b963337..d4f9005 100644
--- a/gtests/AST.FromFile.cpp
+++ b/gtests/AST.FromFile.cpp
@@ -188,6 +188,7 @@
         "structDeref.frag",
         "structure.frag",
         "swizzle.frag",
+        "invalidSwizzle.vert",
         "syntaxError.frag",
         "test.frag",
         "texture.frag",