sub bar () { 'quux' }

$foo{undef} = 'bareword undef is treated as string';
$foo{+undef} = 'function undef is treated as function because +
                is not valid in a bareword string';
$foo{bar} = 'key bar is used';
$foo{+bar} = 'key quux is used';
$foo{bar()} = 'key quux is used again (the old value is overwritten)';
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