Borrowchecker regression in 1.26

[emilyalbini]

• sorz/moproxy regressed from stable to beta (build log) cc @sorz

[emilyalbini]

cc @nikomatsakis

[pnkfelix]

visiting for triage.

@pietroalbini are you in a position to narrow this into a stand-alone test case?

[pnkfelix]

triage : P-high

[emilyalbini]

are you in a position to narrow this into a stand-alone test case?

That was just from crater, I can try bisecting in a few hours though.

[emilyalbini]

@pnkfelix the bisect run points inside of the rollup #49337, and #49299 (edit: wrong copy/paste!) is the one that makes more sense (since the issue affects closures). I'll try investigating more later today.