1 files changed, 14 insertions, 0 deletions
diff --git a/src/type/mod.rs b/src/type/mod.rs
index d020ab3..f08dc1a 100644
--- a/src/type/mod.rs
+++ b/src/type/mod.rs
@@ -68,9 +68,23 @@ pub enum TypeError {
 
     FunAsAtom,
 
+    InvalidFunDef(SExp, FunDefError),
+
     OtherError
 }
 
+#[derive(Debug,PartialEq)]
+pub enum FunDefError {
+    NoFunToken,
+    NoArgumentList,
+    NoTypeList,
+    NoReturnType,
+    NoFunctionBody,
+    InvalidArgumentList,
+    InvalidTypeList,
+    InvalidReturnType,
+}
+
 use Type::*;
 
 impl Type {