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    sub get() { 'a'; }
    use constant get_constant=> 'a';

    sub get { 'a'; }
    sub get { return 'a'; }
    sub get() { return 'a'; }

package class;
use strict;
...
    get_constant => sub { my $a= $object->get_constant; },
    get_constant__paren => sub { my $a= $object->get_constant(); },
};