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-rw-r--r--lib/pure/collections/sequtils.nim4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/pure/collections/sequtils.nim b/lib/pure/collections/sequtils.nim
index 64a7be7a9..5e9b492c2 100644
--- a/lib/pure/collections/sequtils.nim
+++ b/lib/pure/collections/sequtils.nim
@@ -84,6 +84,10 @@ import std/private/since
 
 import macros
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+
 when defined(nimHasEffectsOf):
   {.experimental: "strictEffects".}
 else: