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-rw-r--r--language/l2.lem1
1 files changed, 1 insertions, 0 deletions
diff --git a/language/l2.lem b/language/l2.lem
index 32b6f1c7..2fd685f4 100644
--- a/language/l2.lem
+++ b/language/l2.lem
@@ -484,6 +484,7 @@ type t = (* Internal types *)
| T_fn of t * t * effect
| T_tup of list t
| T_app of id * t_args
+ | T_abbrev of t * t
and t_arg = (* Argument to type constructors *)
| T_arg_typ of t