Beta regression with lifetime inference

[Ryman]

I'm unsure if this issue is specifically related to Borrow or HashMap::get but this playpen works on current stable (1.4), but fails on both beta and nightly.

The issue can be fixed with a type annotation in the simple case, as shown on playpen if you uncomment the line above the failure, so I assume failure is not intended by some change in lifetime rules. (Additionally, the error message itself doesn't help lead a user to the solution here :( )

But, I've got a more complicated manifestation which I've been unable to solve with type-hints so I think it's worth a look at: seanmonstar/unicase#6

Travis outputs for linked PR

cc @nikomatsakis @brson

[bluss]

This should be the same as #28853

[arielb1]

@Ryman

This is a known regression that is the same as #28853. The old code compiled for dubious reasons. Due to the evil nature of find, it is unclear how to get it to compile usefully, except by aggressive use of transmute.

[Ryman]

@arielb1 Okay, should we close as duplicate?

[brson]

Closing per @arielb1 as dupe.