Re: dash bug: double-quoted "\" breaks glob protection for next char

[Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>]

On Mon, Apr 2, 2018 at 2:13 PM, Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx> wrote:
> I was trying some of the beautiful atrocities from one of earlier
> Harald's emails and this one fails in current dash git:
>
> # x="''''"; echo "${x#"${x+''}"''}"
> dash: 12: Syntax error: Missing '}'

Another probably buggy case:

cat <<EOF
-\t-\\-\"-\'-\`-\--\z-\*-\?-
`echo  '-\t-\\-\"-\x-\`-\--\z-\*-\?-'`
$(echo '-\t-\\-\"-\x-\`-\--\z-\*-\?-')
EOF


# bash heredoc_backslash.test
-\t-\-\"-\'-`-\--\z-\*-\?-
-\t-\-\"-\x-`-\--\z-\*-\?-
-\t-\\-\"-\x-\`-\--\z-\*-\?-

# dash heredoc_backslash.test
-\t-\-\"-\'-`-\--\z-\*-\?-
-    -\-"-\x-`-\--\z-\*-\?-
-    -\-\"-\x-\`-\--\z-\*-\?-

(Second and third line have \t expanded to tab. Mail-mangled to spaces, likely)

Apart from \t, note that in second heredoc line there is a difference in how
`echo  '\"'` was handled: bash prints \", dash prints ".
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