[INFO] crate tty 0.5.0 is already in cache
[INFO] extracting crate tty 0.5.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/tty/0.5.0
[INFO] extracting crate tty 0.5.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tty/0.5.0
[INFO] validating manifest of tty-0.5.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tty-0.5.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tty-0.5.0
[INFO] finished frobbing tty-0.5.0
[INFO] frobbed toml for tty-0.5.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/tty/0.5.0/Cargo.toml
[INFO] started frobbing tty-0.5.0
[INFO] finished frobbing tty-0.5.0
[INFO] frobbed toml for tty-0.5.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tty/0.5.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing tty-0.5.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/tty/0.5.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 8054a152c1f231c34d0838d33b4adbdf907b07381242d64bebf97ee7eb4e1bf6
[INFO] running `"docker" "start" "-a" "8054a152c1f231c34d0838d33b4adbdf907b07381242d64bebf97ee7eb4e1bf6"`
[INFO] [stderr]    Compiling termios v0.2.2
[INFO] [stderr]    Compiling fd v0.2.3
[INFO] [stderr]    Compiling chan v0.1.23
[INFO] [stderr]    Compiling chan-signal v0.1.7
[INFO] [stderr]    Compiling tty v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(process_exec)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::os::unix::process::CommandExt::before_exec': should be unsafe, use `pre_exec` instead
[INFO] [stderr]    --> src/lib.rs:118:21
[INFO] [stderr]     |
[INFO] [stderr] 118 |                     before_exec(|| { let _ = unsafe { libc::setsid() }; Ok(()) }).
[INFO] [stderr]     |                     ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `tty`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "8054a152c1f231c34d0838d33b4adbdf907b07381242d64bebf97ee7eb4e1bf6"`
[INFO] running `"docker" "rm" "-f" "8054a152c1f231c34d0838d33b4adbdf907b07381242d64bebf97ee7eb4e1bf6"`
[INFO] [stdout] 8054a152c1f231c34d0838d33b4adbdf907b07381242d64bebf97ee7eb4e1bf6