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-rw-r--r--src/prepare.sml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/prepare.sml b/src/prepare.sml
index f74b8747..a1dd0e79 100644
--- a/src/prepare.sml
+++ b/src/prepare.sml
@@ -60,6 +60,7 @@ fun prepExp (e as (_, loc), sns) =
in
((ECon (dk, pc, SOME e), loc), sns)
end
+ | ENone t => (e, sns)
| ESome (t, e) =>
let
val (e, sns) = prepExp (e, sns)