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-rw-r--r--interp/constrintern.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/interp/constrintern.ml b/interp/constrintern.ml
index 8b93088515..59feb46dc1 100644
--- a/interp/constrintern.ml
+++ b/interp/constrintern.ml
@@ -1487,7 +1487,7 @@ let alias_of als = match als.alias_ids with
let is_zero s =
let rec aux i =
- Int.equal (String.length s) i || (s.[i] == '0' && aux (i+1))
+ Int.equal (String.length s) i || ((s.[i] == '0' || s.[i] == '_') && aux (i+1))
in aux 0
let is_zero n = is_zero n.NumTok.int && is_zero n.NumTok.frac