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!& error

From: Grisha Levit
Subject: !& error
Date: Sat, 12 Aug 2023 13:56:03 -0400 
The newly added support for `! &' uses the previous value of
the_printed_command_except_trap or segfaults if none has been made yet:

$ bash -c ': X; ! & jobs'
[1]+ Running : X &
$ bash -c '! &'
Segmentation fault
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