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noexec does not detect subscript error

X-seq: zsh-workers 49710
From: gqqnb2005 <gqqnb2005@xxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: noexec does not detect subscript error
Date: Wed, 26 Jan 2022 21:42:59 +0800
Archived-at: <https://zsh.org/workers/49710>
List-id: <zsh-workers.zsh.org>

$ cat a.sh
a=$argv[
$ zsh -n a.sh
$ zsh a.sh
a.sh:1: invalid subscript

The above z shell commands show my a.sh only has "a=$argv[" which
clearly has a syntax error. Then I use zsh -n (noexec) to check the
syntax, zsh does not report any error.

Can the error be fixed so that the -n (noexec) detects these kinds of
apparent errors?

Follow-Ups:
- Re: noexec does not detect subscript error
  - From: Bart Schaefer

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