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-rw-r--r--compiler/concepts.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/concepts.nim b/compiler/concepts.nim
index 885b69c60..89a2bdc10 100644
--- a/compiler/concepts.nim
+++ b/compiler/concepts.nim
@@ -15,6 +15,9 @@ import ast, astalgo, semdata, lookups, lineinfos, idents, msgs, renderer, types,
 
 from magicsys import addSonSkipIntLit
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
 const
   logBindings = false