bugfix: type verification functions can be Builtins

1 files changed, 1 insertions, 1 deletions

diff --git a/neb/__init__.py b/neb/__init__.py
index 0757071..099bc2a 100644
--- a/neb/__init__.py
+++ b/neb/__init__.py
@@ -186,7 +186,7 @@ class TypeWrap:
         # if it's an any type, it's valid
         if self.parent is None:
             return Bool(True)
-        if isinstance(self.is_func, UserFunction):
+        if isinstance(self.is_func, Function):
             valid = self.is_func.call(Expr([self.name, target]), env, ns)
         else:
             valid = self.is_func(self.name, [target], env, ns)