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-rw-r--r--src/mono.sml2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mono.sml b/src/mono.sml
index b19f5af6..9599433c 100644
--- a/src/mono.sml
+++ b/src/mono.sml
@@ -34,7 +34,7 @@ datatype datatype_kind = datatype Core.datatype_kind
datatype typ' =
TFun of typ * typ
| TRecord of (string * typ) list
- | TDatatype of datatype_kind * int * (string * int * typ option) list
+ | TDatatype of int * (datatype_kind * (string * int * typ option) list) ref
| TFfi of string * string
withtype typ = typ' located