[3.10] bpo-29298: Fix crash with required subparsers without dest (GH-3680) #27303
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Automerge-Triggered-By: GH:encukou
(cherry picked from commit 17575f7)
Co-authored-by: Anthony Sottile [email protected]
https://bugs.python.org/issue29298
Automerge-Triggered-By: GH:encukou