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-rw-r--r--lib/system/iterators.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/system/iterators.nim b/lib/system/iterators.nim
index f23f7aa11..6d33fc0bc 100644
--- a/lib/system/iterators.nim
+++ b/lib/system/iterators.nim
@@ -1,3 +1,6 @@
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 when defined(nimHasLentIterators) and not defined(nimNoLentIterators):
   template lent2(T): untyped = lent T
 else: