Add a `for .. from ..` loop for generators, see #4306, #3832#4355

Merged

GeoffreyBooth merged 20 commits intojashkenas:masterfrom GeoffreyBooth:for-from

Nov 8, 2016

+228-61

Commits on Sep 18, 2016

Commits on Oct 29, 2016

Commits on Oct 31, 2016

Refactor the big if block in the lexer to be as minimal a change from master as we can get away with
GeoffreyBooth
committed
Cleanup to make more idiomatic, remove trailing whitespace, minor performance improvements
GeoffreyBooth
committed

Commits on Nov 1, 2016