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-rw-r--r--checker/checker.ml4
1 files changed, 3 insertions, 1 deletions
diff --git a/checker/checker.ml b/checker/checker.ml
index 0c411ae44..06d0cd1c0 100644
--- a/checker/checker.ml
+++ b/checker/checker.ml
@@ -213,7 +213,9 @@ let report () = (str "." ++ spc () ++ str "Please report.")
let guill s = str "\"" ++ str s ++ str "\""
-let where s =
+let where = function
+| None -> mt ()
+| Some s ->
if !Flags.debug then (str"in " ++ str s ++ str":" ++ spc ()) else (mt ())
let rec explain_exn = function