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-rw-r--r--Jennisys/TypeChecker.fs1
1 files changed, 1 insertions, 0 deletions
diff --git a/Jennisys/TypeChecker.fs b/Jennisys/TypeChecker.fs
index 41ffbb5d..6ca13453 100644
--- a/Jennisys/TypeChecker.fs
+++ b/Jennisys/TypeChecker.fs
@@ -24,6 +24,7 @@ let IsUserType prog tpo =
let tpname = match tp with
| NamedType(tname) -> tname
| InstantiatedType(tname, _) -> tname
+ | _ -> ""
match prog with
| Program(components) -> components |> List.filter (function Component(Class(name,_,_),_,_) when name = tpname -> true
| _ -> false) |> List.isEmpty |> not