[Bug 11721] New: ash subshell vs. arithmetic bracket parsing issue

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11721

            Bug ID: 11721
           Summary: ash subshell vs. arithmetic bracket parsing issue
           Product: Busybox
           Version: 1.30.x
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned at busybox.net
          Reporter: osm0sis at outlook.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Nesting brackets as follows in ash does not follow the standard in bash, mksh
or even busybox's hush:

this=$((blah || blarg) 2>/dev/null);

To better test remove the redirect for the following command (noting the space
to preserve the nesting):

this=$((blah || blarg) );

On any shell I've tested but ash this correctly gives error 127 for the
commands grouped not being able to run. ash instead incorrectly interprets it
as an arithmetic statement, presumably due to the $((, despite it not closing
with )), and will hang awaiting )) or in a script will error out it missing the
)).

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