Doesn't the following bit of code work? It's only slightly more obtuse than what you propose.
thatroutine() and return 1;

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UPDATE: I just tested this to prevent ignorance, and it does in fact work.
UPDATE AGAIN: Ah, I missed the point. My code does not return the value returned by thatroutine(). If there are no side effects I suppose you could do:
thatroutine() and return thatroutine();

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:-)
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My mission: To boldy split infinitives that have never been split before!

In reply to Re^2: looking for a good idiom: return this if this is true by DentArthurDent
in thread looking for a good idiom: return this if this is true by merlyn

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