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-rw-r--r--stdlib/source/library/lux/time/date.lux2
1 files changed, 1 insertions, 1 deletions
diff --git a/stdlib/source/library/lux/time/date.lux b/stdlib/source/library/lux/time/date.lux
index 402700a81..a2a455fa1 100644
--- a/stdlib/source/library/lux/time/date.lux
+++ b/stdlib/source/library/lux/time/date.lux
@@ -31,7 +31,7 @@
(def: month_by_number
(Dictionary Nat Month)
(list\fold (function (_ month mapping)
- (dictionary.put (//month.number month) month mapping))
+ (dictionary.has (//month.number month) month mapping))
(dictionary.empty n.hash)
//month.year))