:assign and scopes

Quick question - should ":assign _top.foo" work in a subrecipe?

I have:

====main.aap====
:child tmp.aap
:print $foo
========

====tmp.aap====
:print "foo" | :assign _top.foo
========


aap returns:
Aap: Error in recipe "/data/home/richard/stuff/aap_example/main.aap" 
line 2: Unknown variable: "foo"


If tmp.aap contains

:print "foo" | :assign tmp
_top.foo = $tmp


aap returns "foo" as expected.

-- 
Richard



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