diff -r 2f2107c01dee -r 6edc8800dbc3 mercurial/dispatch.py
--- a/mercurial/dispatch.py	Fri Oct 08 13:36:02 2021 -0700
+++ b/mercurial/dispatch.py	Tue Mar 02 09:33:25 2021 -0800
@@ -316,7 +316,10 @@
             except IOError as inst:
                 if inst.errno != errno.EPIPE:
                     raise
-            ret = -1
+            if req.ui.configbool(b'ui', b'detailed-exit-code'):
+                ret = 250
+            else:
+                ret = -1
         finally:
             duration = util.timer() - starttime
             try: