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-rw-r--r--src/typing.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/typing.ml b/src/typing.ml
index 353c1ad..7a76b69 100644
--- a/src/typing.ml
+++ b/src/typing.ml
@@ -175,6 +175,7 @@ let rec subtype env a b = match a, b with
| T_Int, T_Int -> true
| T_Void, T_Void -> true
| Typenull, TPoint(_) -> true
+ | TPoint(TPoint(TClass(_))), TPoint(TPoint(_)) -> false
| TPoint(ka), TPoint(kb) -> subtype env ka kb
| TClass(i), TClass(j) ->
let c = get_c env i in