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-rw-r--r--lib/pure/ropes.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/pure/ropes.nim b/lib/pure/ropes.nim
index 42550af1d..8750aca87 100644
--- a/lib/pure/ropes.nim
+++ b/lib/pure/ropes.nim
@@ -19,6 +19,9 @@
 include system/inclrtl
 import std/streams
 
+when defined(nimPreviewSlimSystem):
+  import std/[syncio, formatfloat, assertions]
+
 {.push debugger: off.} # the user does not want to trace a part
                        # of the standard library!