[Mason] How to specify child actions in parent component

[Ben. B. <ben...@gm...>]

Hello all,

What is the best way to specify an action in a parent component that a
child component will execute (sometimes only under certain
circumstances i.e. errors)?

For example, in parent.html;
In parent
<%perl>
sub die_sub { $m->redirect('foo.html');}
$m->subexec('child.mas', die_sub=3D>\&die_sub );
$m->clear_buffer();
die;
</%perl>
# END parent.html

And in child.mas:
In child
<%init>
# doing stuff, oops something went wrong
&$die_sub;
</%init>
<%args>
$die_sub=3D>sub{ $m->redirect('404.html'); } # default redirect page
</%args>
<%flags>
inherit=3D>undef
</%flags>
# END child.mas

Finally in 404.html:
Something must have gone wrong...
# END 404.html

Is this an acceptable way to handle errors? Is there a better way? If
so, where is it documented? Thanks!