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-rw-r--r--lib/system/iterators.nim1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/system/iterators.nim b/lib/system/iterators.nim
index 6d33fc0bc..220e341b3 100644
--- a/lib/system/iterators.nim
+++ b/lib/system/iterators.nim
@@ -92,6 +92,7 @@ iterator mitems*(a: var cstring): var char {.inline.} =
   runnableExamples:
     from std/sugar import collect
     var a = "abc\0def"
+    prepareMutation(a)
     var b = a.cstring
     let s = collect:
       for bi in mitems(b):
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