[INFO] crate two_timer 1.2.0 is already in cache
[INFO] extracting crate two_timer 1.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/two_timer/1.2.0
[INFO] extracting crate two_timer 1.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/two_timer/1.2.0
[INFO] validating manifest of two_timer-1.2.0 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 two_timer-1.2.0 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 two_timer-1.2.0
[INFO] finished frobbing two_timer-1.2.0
[INFO] frobbed toml for two_timer-1.2.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/two_timer/1.2.0/Cargo.toml
[INFO] started frobbing two_timer-1.2.0
[INFO] finished frobbing two_timer-1.2.0
[INFO] frobbed toml for two_timer-1.2.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/two_timer/1.2.0/Cargo.toml
[INFO] crate two_timer-1.2.0 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing two_timer-1.2.0 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/two_timer/1.2.0:/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] b15162d6a64cd9c971bed27488e53591c866e288be6d024d62729931a091fa55
[INFO] running `"docker" "start" "-a" "b15162d6a64cd9c971bed27488e53591c866e288be6d024d62729931a091fa55"`
[INFO] [stderr]    Compiling ucd-util v0.1.2
[INFO] [stderr]    Compiling regex v1.0.6
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr]    Compiling regex-syntax v0.6.3
[INFO] [stderr]    Compiling pidgin v0.3.0
[INFO] [stderr]    Compiling two_timer v1.2.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.97s
[INFO] running `"docker" "inspect" "b15162d6a64cd9c971bed27488e53591c866e288be6d024d62729931a091fa55"`
[INFO] running `"docker" "rm" "-f" "b15162d6a64cd9c971bed27488e53591c866e288be6d024d62729931a091fa55"`
[INFO] [stdout] b15162d6a64cd9c971bed27488e53591c866e288be6d024d62729931a091fa55
[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/two_timer/1.2.0:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 71aeb85ad77a8662fcecceb47b1087d77cdd256b059d21f61b740a47fedc7221
[INFO] running `"docker" "start" "-a" "71aeb85ad77a8662fcecceb47b1087d77cdd256b059d21f61b740a47fedc7221"`
[INFO] [stderr]    Compiling two_timer v1.2.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> tests/tests.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[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 `two_timer`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "71aeb85ad77a8662fcecceb47b1087d77cdd256b059d21f61b740a47fedc7221"`
[INFO] running `"docker" "rm" "-f" "71aeb85ad77a8662fcecceb47b1087d77cdd256b059d21f61b740a47fedc7221"`
[INFO] [stdout] 71aeb85ad77a8662fcecceb47b1087d77cdd256b059d21f61b740a47fedc7221