[nll] When compiling hyper (0.11 branch): panicked at 'scrape_region_constraints

[sdroege]

This happens with https://github.com/hyperium/hyper/tree/0.11.x but not master when compiling with

RUSTFLAGS="-Zborrowck=mir -Ztwo-phase-borrows" cargo +nightly build --all

   Compiling hyper v0.11.27 (file:///home/slomo/Projects/rust/hyper)
thread 'main' panicked at 'scrape_region_constraints: incoming region obligations = [
    (
        NodeId(
            4242
        ),
        RegionObligation(sub_region=ReStatic, sup_type=B)
    )
]', librustc/traits/query/type_op/custom.rs:85:5
note: Run with `RUST_BACKTRACE=1` for a backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.30.0-nightly (73c78734b 2018-08-05) running on x86_64-unknown-linux-gnu

note: compiler flags: -Z borrowck=mir -Z two-phase-borrows -C debuginfo=2 -C incremental --crate-type lib

note: some of the compiler flags provided by cargo are hidden

error: Could not compile `hyper`.

To learn more, run the command again with --verbose.

[matthiaskrgr]

Looks like #53182 / #52992

[sdroege]

Indeed