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-rw-r--r--src/mono_reduce.sig2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/mono_reduce.sig b/src/mono_reduce.sig
index 2495c7f9..a6b6cc81 100644
--- a/src/mono_reduce.sig
+++ b/src/mono_reduce.sig
@@ -33,4 +33,6 @@ signature MONO_REDUCE = sig
val subExpInExp : int * Mono.exp -> Mono.exp -> Mono.exp
+ val impure : Mono.exp -> bool
+
end