Ah. Now I get the key point you were making about scope — that the `as 
<something>` variable is in the surrounding scope following the execution of 
the `with` block.

You're right. That really does already do pretty close to what I am asking for. 
It's just a hair short in that it requires an additional line to get the result 
out of the builder, but that's not enough of a big deal to make significant 
changes to the capabilities of context managers.
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