Possible beta to nightly regression (from

[cpcloud]

Possible regression from beta-1.39 to nightly-1.40, exposed by tonic

I tried this code (using the rust nix overlay):

$ cd tonic
$ nix-shell -p latest.rustChannels.nightly.rust rls cargo openssl pkg-config
$ cargo build

I expected to see this happen: a successful build

Instead, this happened: a build error

Meta

rustc --version --verbose:

$ rustc --version --verbose                                                                      101 ↵
rustc 1.40.0-nightly (702b45e40 2019-10-01)
binary: rustc
commit-hash: 702b45e409495a41afcccbe87a251a692b0cefab
commit-date: 2019-10-01
host: x86_64-unknown-linux-gnu
release: 1.40.0-nightly
LLVM version: 9.0

Backtrace:

$ cargo build
   Compiling serde_json v1.0.40
   Compiling prost-build v0.5.0
   Compiling tonic v0.1.0-alpha.1 (/home/cloud/Documents/code/rust/tonic/tonic)
error: internal compiler error: src/librustc/ich/impls_ty.rs:100: StableHasher: unexpected region '_#0r

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:912:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

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 1.40.0-nightly (702b45e40 2019-10-01) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental --crate-type lib

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

error: aborting due to previous error

error: could not compile `tonic`.
warning: build failed, waiting for other jobs to finish...
error: build failed

[mati865]

Duplicate of #64964

[nagisa]

Duplicate of #64964

[cpcloud]

Thanks!