Snippet 1:

    sub Foo::show { print 'Foo::show' };
    my %class = ( name => 'Foo' );
    print qq{ $class{name}->show; #};
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Snippet 2:

    sub Foo::show { print 'Foo::show' };
    my %class = ( 'name}' => 'Foo' );
    print qq{ $class{'name}'}->show; #};
[download]

One of the above two snippets compiles. One does not. Without testing, can you tell which is which (and what, if any, output it produces) and, more importantly, why? To be fair, I can answer the first question, but not the second (I suspect that we're simply throwing too much at the Perl parser).

I think this is a bug in Perl, but perhaps it should be one of those "don't do that" sort of bugs. Thus, this is really an unfair quiz :)