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Pipeline hangs after setting monitor in interactive subshell

X-seq: zsh-workers 45647
From: Roman Perepelitsa <roman.perepelitsa@xxxxxxxxx>
To: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Pipeline hangs after setting monitor in interactive subshell
Date: Sun, 29 Mar 2020 11:16:31 +0200
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This hangs:

  zsh -fic '( setopt monitor; true | true )'

All of these work fine:

  zsh -fc '( setopt monitor; true | true )'
  zsh -fc 'setopt monitor; true | true'
  zsh -fic '(true | true)'
  zsh -fic '( setopt monitor; =true )'
  zsh -fic '( setopt monitor; true &; wait )'

Zsh from a6610c4a17 (tip of master at the moment of writing). I
haven't checked it with other versions and haven't look at the code.

Roman.

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