Re: https://github.com/att/ast/issues/71

Consider this test script:

(set -o posix) 2>/dev/null && set -o posix
emulate sh 2>/dev/null  # for zsh
for var in 'a-c' '!a'; do
        case b in
        ( ["$var"] )  echo 'quirk' ;;
        ( [$var] )      echo 'no quirk' ;;
        esac
done

Most shells output 'no quirk' for both values of 'var', but AT&T ksh93 outputs 'quirk' for both, as does zsh 5.2 and earlier (zsh-as-sh changed to match the majority in 5.3). Now one of the current ksh93 lead developers says this does not look like a bug.

Does POSIX specify anything, either way, regarding the effect of shell quoting within glob bracket patterns? I can't find any relevant text under "2.13 Pattern Matching Notation" or anything it references, so clarification would be appreciated.

Thanks,

- Martijn

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