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-rw-r--r--src/mono.sml3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mono.sml b/src/mono.sml
index 6a5687ed..39de583c 100644
--- a/src/mono.sml
+++ b/src/mono.sml
@@ -49,6 +49,9 @@ datatype exp' =
| ERecord of (string * exp * typ) list
| EField of exp * string
+ | EStrcat of exp * exp
+
+
withtype exp = exp' located
datatype decl' =