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-rw-r--r--lib/core/macros.nim4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/core/macros.nim b/lib/core/macros.nim
index 4d040cebc..f20ca9385 100644
--- a/lib/core/macros.nim
+++ b/lib/core/macros.nim
@@ -10,6 +10,10 @@
 include "system/inclrtl"
 import std/private/since
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+
 ## This module contains the interface to the compiler's abstract syntax
 ## tree (`AST`:idx:). Macros operate on this tree.
 ##