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-rw-r--r--lib/pure/collections/sets.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/collections/sets.nim b/lib/pure/collections/sets.nim
index c25161ed0..4a20d00a4 100644
--- a/lib/pure/collections/sets.nim
+++ b/lib/pure/collections/sets.nim
@@ -276,7 +276,7 @@ proc excl*[A](s: var HashSet[A], key: A) =
         if isEmpty(s.data[i].hcode):   # end of collision cluster; So all done
           return
         r = s.data[i].hcode and msk    # "home" location of key@i
-      s.data[j] = s.data[i]            # data[j] will be marked EMPTY next loop
+      shallowCopy(s.data[j], s.data[i]) # data[j] will be marked EMPTY next loop
 
 proc excl*[A](s: var HashSet[A], other: HashSet[A]) =
   ## Excludes everything in `other` from `s`.