bin/52426: Undetected syntax errors in /bin/sh

[kre%munnari.OZ.AU@localhost]

>Number:         52426
>Category:       bin
>Synopsis:       Undetected syntax errors in /bin/sh
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jul 25 01:40:00 +0000 2017
>Originator:     Robert Elz
>Release:        NetBSD 8.99.1
>Organization:
>Environment:
		Irrelevant, any NetBSD /bin/sh (forever).
>Description:
	sh accepts both of these lines of nonsense, without error

		: ; }

		case x in <|() ;; esac

	Both can also be observed in dash and the second in the FreeBSD sh.
	They are very old ash bugs (FreeBSD have fixed the first one.)

>How-To-Repeat:
	Just use input something like one of the above.
>Fix:
  Workaround:  Don't write gibberish sh code.

  Real fix coming soon (as in, already implemented, undergoing testing.)