Added more tests

src/errors/Common.go

@@ -18,6 +18,7 @@ var (
 	MissingGroupEnd            = &Base{"Missing ')'"}
 	MissingMainFunction        = &Base{"Missing main function"}
 	MissingOperand             = &Base{"Missing operand"}
+	MissingParameter           = &Base{"Missing parameter"}
 	MissingType                = &Base{"Missing type"}
 	NotImplemented             = &Base{"Not implemented"}
 	UnknownType                = &Base{"Unknown type"}