[BUG] ignored trap and subshell

[Vincent Lefevre <vincent@xxxxxxxxxx>]

The zshmisc(1) man page says:

    ( list )
        Execute list in a subshell.  Traps set by the trap builtin are
        reset to their default values while executing list.

However, with "emulate sh", ignored traps should still be ignored
in the subshell according to POSIX, and zsh 5.8 fails do conform:

$ zsh -c 'emulate sh; trap "" INT; trap; echo A; ( trap; echo B; sleep 3; ); echo $?'
trap -- '' INT
A
B
^C130

where Ctrl-C immediately interrupts the sleep.

Compare to sh:

$ sh -c 'trap "" INT; trap; echo A; ( trap; echo B; sleep 3; ); echo $?'
trap -- '' INT
A
trap -- '' INT
B
^C0

where the sleep isn't interrupted by Ctrl-C.

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)