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sub alpha {
    my $self = shift;
...
    push @foo, [ @bar ] if $self->{baz} eq $gamma;
    return \@foo;
}

    push @foo, [ @bar ];

    push @foo, [ @bar ] if $self->{baz} eq $gamma;

sub alpha {
    my $self = shift;
...
    push @foo, [ @bar ] if &$coderef;
    return \@foo;
}