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-rw-r--r--lib/pure/collections/sequtils.nim3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/pure/collections/sequtils.nim b/lib/pure/collections/sequtils.nim
index f101d508e..51d8ade85 100644
--- a/lib/pure/collections/sequtils.nim
+++ b/lib/pure/collections/sequtils.nim
@@ -527,7 +527,8 @@ proc insert*[T](dest: var seq[T], src: openArray[T], pos = 0) =
     assert dest == outcome
 
   var j = len(dest) - 1
-  var i = len(dest) + len(src) - 1
+  var i = j + len(src)
+  if i == j: return
   dest.setLen(i + 1)
 
   # Move items after `pos` to the end of the sequence.