Building a program from a library

I have the following aap recipe:
---begin---
bar.c:
     :print int main(){return 0;} >$target
:lib baz : bar.c
:program bar : baz
---end---

I would expect this to build the program "bar".  However, instead I get:

$ aap
Aap: Error in recipe "/data/home/richard/stuff/tmp/main.aap" line 4: Do 
not know how to make an object out of "baz"
$

I can make the recipe work by changing it to:
---begin---
bar.c:
     :print int main(){return 0;} >$target
:lib baz {filetype=object} : bar.c
:program bar : baz
---end---

With this latter recipe, aap creates "libbaz.a", and then links it into 
executable "bar".

Can anyone explain why the attribute is neccessary, and if this is 
intentional or a bug?

Assuming it's not intentional, should there be rules somewhere (in 
default.aap perhaps?) which say how to convert a node of filetype "lib" 
to one of type "object"?  Or should there be build rules for building a 
program using a "lib"?  Or should it be addressed in some other way.

-- 
Richard



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