view .arcconfig @ 42455:5ca136bbd3f6

worker: support parallelization of functions with return values

Currently worker supports running functions that return a progress
iterator. Generalize it to handle function that return a progress
iterator then a return value.

It's unused in this commit, but will be used in the next one.

Differential Revision: https://phab.mercurial-scm.org/D6515

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