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-rw-r--r--src/mono.sml2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mono.sml b/src/mono.sml
index cbe935c0..4ac21330 100644
--- a/src/mono.sml
+++ b/src/mono.sml
@@ -69,6 +69,8 @@ datatype exp' =
| EStrcat of exp * exp
+ | EError of exp * typ
+
| EWrite of exp
| ESeq of exp * exp
| ELet of string * typ * exp * exp