regression: local ambiguity: multiple parsing options: built-in NTs lifetime

[Mark-Simulacrum]

https://crater-reports.s3.amazonaws.com/beta-1.43-1/beta-2020-03-12/reg/pin-project-lite-0.1.4/log.txt

cc @Centril

[Centril]

Possibly accidentally injected by #70074.
Would be good to find out why this is happening, so let's @rustbot ping cleanup
and see if we can bisect / shrink the problem down to something usable for finding a fix.

[Centril]

@rustbot ping cleanup

[rustbot]

Hey Cleanup Crew ICE-breakers! This bug has been identified as a good
"Cleanup ICE-breaking candidate". In case it's useful, here are some
instructions for tackling these sorts of bugs. Maybe take a look?
Thanks! <3

cc @AminArria @chrissimpkins @contrun @DutchGhost @elshize @ethanboxx @h-michael @HallerPatrick @hdhoang @hellow554 @imtsuki @jakevossen5 @kanru @KarlK90 @LeSeulArtichaut @MAdrianMattocks @matheus-consoli @mental32 @nmccarty @Noah-Kennedy @pard68 @PeytonT @pierreN @Redblueflame @RobbieClarken @RobertoSnap @robjtede @SarthakSingh31 @senden9 @shekohex @sinato @spastorino @turboladen @woshilapin @yerke

[LeSeulArtichaut]

Failed to confirm that #70074 is the cause:
tested 342c5f33d097b2dc07a2dbc0ca45a37379d2ff60, got Yes
Seems like it regressed prior to 342c5f3

[AminArria]

searched nightlies: from nightly-2020-02-26 to nightly-2020-03-04
regressed nightly: nightly-2020-02-29
searched commits: from https://github.com/rust-lang/rust/commit/6d69caba110c0c2fb90180df1cbc8be5033b91d4 to https://github.com/rust-lang/rust/commit/0eb878d2aa6e3a1cb315f3f328681b26bb4bffdb
regressed commit: https://github.com/rust-lang/rust/commit/0eb878d2aa6e3a1cb315f3f328681b26bb4bffdb

For code I used:

use pin_project_lite::pin_project;

pin_project! {
    pub struct Struct<T: 'static> {
        field: T
    }
}


fn main() {

}

[LeSeulArtichaut]

@rustbot modify labels: -E-needs-bisection