adjust .merlin and finally fix that genlua warning

.merlin

@@ -1,4 +1,4 @@
 S src/**
-B src/**
+B _build/src/**
 S libs/**
 B libs/**

src/generators/genlua.ml

@@ -1748,7 +1748,7 @@ let generate_type ctx = function
 	| TEnumDecl e ->
 		if not e.e_extern then generate_enum ctx e
 		else ();
-	| TTypeDecl _ | TAbstractDecl _ | _ -> ()
+	| TTypeDecl _ | TAbstractDecl _ -> ()
 
 let generate_type_forward ctx = function
 	| TClassDecl c ->