diff --git a/schala-lang/language/Cargo.toml b/schala-lang/language/Cargo.toml
index cba92f2..7632789 100644
--- a/schala-lang/language/Cargo.toml
+++ b/schala-lang/language/Cargo.toml
@@ -12,6 +12,7 @@ lazy_static = "1.3.0"
 failure = "0.1.5"
 ena = "0.11.0"
 stopwatch = "0.0.7"
+derivative = "1.0.3"
 
 schala-lang-codegen = { path = "../codegen" }
 schala-repl = { path = "../../schala-repl" }
diff --git a/schala-lang/language/src/lib.rs b/schala-lang/language/src/lib.rs
index 554d99e..af0e29f 100644
--- a/schala-lang/language/src/lib.rs
+++ b/schala-lang/language/src/lib.rs
@@ -16,6 +16,7 @@ extern crate schala_repl;
 #[macro_use]
 extern crate schala_lang_codegen;
 extern crate ena;
+extern crate derivative;
 
 
 macro_rules! bx {
diff --git a/schala-lang/language/src/parsing/test.rs b/schala-lang/language/src/parsing/test.rs
index 376ce55..06fd114 100644
--- a/schala-lang/language/src/parsing/test.rs
+++ b/schala-lang/language/src/parsing/test.rs
@@ -20,7 +20,9 @@ fn parse(input: &str) -> ParseResult<AST> {
 }
 
 macro_rules! parse_test {
-  ($string:expr, $correct:expr) => { assert_eq!(parse($string).unwrap(), $correct) };
+  ($string:expr, $correct:expr) => { 
+    assert_eq!(parse($string).unwrap(), $correct)
+  };
 }
 macro_rules! parse_test_wrap_ast {
   ($string:expr, $correct:expr) => { parse_test!($string, AST { statements: vec![$correct] }) }