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-rw-r--r--lib/std/strbasics.nim4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/std/strbasics.nim b/lib/std/strbasics.nim
index 6f6db5c37..be1dd7a58 100644
--- a/lib/std/strbasics.nim
+++ b/lib/std/strbasics.nim
@@ -11,6 +11,10 @@
 ##
 ## Experimental API, subject to change.
 
+when defined(nimPreviewSlimSystem):
+  import std/assertions
+
+
 const whitespaces = {' ', '\t', '\v', '\r', '\l', '\f'}
 
 proc add*(x: var string, y: openArray[char]) =