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-rw-r--r--lib/system.nim1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/system.nim b/lib/system.nim
index 424d9694d..8f653c1e0 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -442,6 +442,7 @@ type
                                         ## providing an exception message
                                         ## is bad style.
     trace: string
+    up: ref Exception # used for stacking exceptions. Not exported!
 
   SystemError* = object of Exception ## \
     ## Abstract class for exceptions that the runtime system raises.