main @> keys %test::
    undef
    main @> %{"test::h"} ? 1 : 0
    0
    main @> keys %test::
    'h'
    main @> defined %{"test::h2"} ? 1 : 0
    0
    main @> keys %test::
    'h'
    main @> *{"test::h3"}{HASH} ? 1 : 0
    0
    main @> keys %test::
    h  h3
    main @> defined *{"test::h4"}{HASH} ? 1 : 0
    0
    main @> keys %test::
    h  h3 h4

##</code><code>##

exists $test::{"h"} && *{"test::h"}{HASH}