1 files changed, 14 insertions, 0 deletions
diff --git a/neb/interpreter.py b/neb/interpreter.py
index a80f5d4..7045219 100644
--- a/neb/interpreter.py
+++ b/neb/interpreter.py
@@ -74,6 +74,9 @@ class Builtin(Function):
     def __init__(self, callable_, args=None, many=None):
         super().__init__("<builtin>", None, callable_, args, many)
 
+    def __str__(self):
+        return f"builtin function {self.name}"
+
     def call(self, expr, env, ns):
         self.arity_check(expr.args[0], expr.args[1:])
         evaluated_args = self.evaluate_args(expr.args[0], expr.args[1:], env, ns)
@@ -86,6 +89,17 @@ class UserFunction(Function):
         newparams, args, many = self.process_params(name, params)
         super().__init__(name, newparams, body, args, many)
 
+    def __str__(self):
+        out = f"(func {self.name} ("
+        args_list = [f"{a.name} {a.type_}" for a in self.args]
+        if self.many:
+            args_list.append(f"{self.many.name} {self.many.type_}")
+        out = out + " ".join(args_list) + ") "
+        for expr in self.body:
+            out = out + f"{expr} "
+        return out.strip() + ")"
+
+
     def process_params(self, name, params):
         newparams = []
         args = []