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-rw-r--r--src/mono_reduce.sml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mono_reduce.sml b/src/mono_reduce.sml
index 42f32256..9ae44e47 100644
--- a/src/mono_reduce.sml
+++ b/src/mono_reduce.sml
@@ -45,6 +45,7 @@ fun impure (e, _) =
| ERel _ => false
| ENamed _ => false
| ECon (_, _, eo) => (case eo of NONE => false | SOME e => impure e)
+ | ENone _ => false
| ESome (_, e) => impure e
| EFfi _ => false
| EFfiApp _ => false