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-rw-r--r--lib/system/channels.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/system/channels.nim b/lib/system/channels.nim
index d0294322a..9c3cc93e0 100644
--- a/lib/system/channels.nim
+++ b/lib/system/channels.nim
@@ -13,6 +13,9 @@
 ##

 ## **Note:** The current implementation of message passing is slow and does

 ## not work with cyclic data structures.

+  
+when not defined(NimString): 
+  {.error: "You must not import this module explicitly".}
 

 type

   pbytes = ptr array[0.. 0xffff, byte]