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package Foo {
    use Moo;
...
    has 'attr_B' => ( is => 'ro', default => sub { 'B' } );
    has 'attr_C' => ( is => 'ro', isa => sub { die unless $_[0] > 0 } 
+);
}

package Foo {
    use Moo;
...
    has 'attr_B' => ( default => sub { 'B' } );
    has 'attr_C' => ( isa => sub { die unless $_[0] > 0 } );
}