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-rw-r--r--compiler/closureiters.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/closureiters.nim b/compiler/closureiters.nim
index 4d9aeb3f7..6370d0dcb 100644
--- a/compiler/closureiters.nim
+++ b/compiler/closureiters.nim
@@ -133,6 +133,9 @@ import
   renderer, magicsys, lowerings, lambdalifting, modulegraphs, lineinfos,
   tables, options
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 type
   Ctx = object
     g: ModuleGraph