diff --git a/schala-lang/language/src/ast_visitor.rs b/schala-lang/language/src/ast_visitor.rs
index f346785..a65bcbf 100644
--- a/schala-lang/language/src/ast_visitor.rs
+++ b/schala-lang/language/src/ast_visitor.rs
@@ -1,3 +1,5 @@
+use std::rc::Rc;
+
 use ast::*;
 
 pub fn dispatch<T, V: ASTVisitor<T>>(visitor: &mut V, ast: &AST) -> T {
@@ -45,7 +47,7 @@ pub trait DeclarationVisitor<T> {
       FuncSig(sig) => visitor.func_signature(sig),
       FuncDecl(sig, block) => visitor.func_declaration(sig, block),
       TypeDecl { name, body, mutable } => visitor.type_declaration(name, body, mutable),
-      TypeAlias(..) => unimplemented!(), 
+      TypeAlias(alias, name) => visitor.type_alias(alias, name),
       Binding { .. } => unimplemented!(),
       Impl { .. } => unimplemented!(),
       Interface { .. } => unimplemented!(),
@@ -57,6 +59,7 @@ pub trait DeclarationVisitor<T> {
   fn func_signature(&mut self, _sig: &Signature) { }
   fn func_declaration(&mut self, _sig: &Signature, _block: &Vec<Statement>) { }
   fn type_declaration(&mut self, _name: &TypeSingletonName, _body: &TypeBody, _mutable: &bool) { }
+  fn type_alias(&mut self, _alias: &Rc<String>, _name: &Rc<String>) { }
   fn done(&mut self) -> T;
 }
 
@@ -92,3 +95,20 @@ impl DeclarationVisitor<()> for NullVisitor {
   }
 }
 
+#[cfg(test)]
+mod visitor_tests {
+  use ::tokenizing::{Token, tokenize};
+  use ::parsing::ParseResult;
+  use ::ast::AST;
+
+  fn parse(input: &str) -> ParseResult<AST> {
+    let tokens = tokenize(input);
+    let mut parser = ::parsing::Parser::new(tokens);
+    parser.parse()
+  }
+
+  #[test]
+  fn test() {
+    let q = parse("foo");
+  }
+}