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diff --git a/lib/xwhen.h b/lib/xwhen.h
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+# XWHEN.H -- Exception handling definitions.
+
+define X_ACV 501 # access violation
+define X_ARITH 502 # arithmetic error
+define X_INT 503 # keyboard interrupt
+define X_IPC 504 # write to IPC with no reader
+define X_IGNORE NULL # ignore exception