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-rw-r--r--lib/cWarnings.ml2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/cWarnings.ml b/lib/cWarnings.ml
index 68664d1ab..1a1944d61 100644
--- a/lib/cWarnings.ml
+++ b/lib/cWarnings.ml
@@ -136,7 +136,7 @@ let uniquize_flags_rev flags =
let visited =
try
let warnings = Hashtbl.find categories name in
- CString.Set.union visited (CString.Set.of_list warnings)
+ List.fold_left (fun v w -> CString.Set.add w v) visited warnings
with Not_found ->
visited
in