[INFO] crate convert-base 1.0.2 is already in cache
[INFO] extracting crate convert-base 1.0.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/convert-base/1.0.2
[INFO] extracting crate convert-base 1.0.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/convert-base/1.0.2
[INFO] validating manifest of convert-base-1.0.2 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 convert-base-1.0.2 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 convert-base-1.0.2
[INFO] finished frobbing convert-base-1.0.2
[INFO] frobbed toml for convert-base-1.0.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/convert-base/1.0.2/Cargo.toml
[INFO] started frobbing convert-base-1.0.2
[INFO] finished frobbing convert-base-1.0.2
[INFO] frobbed toml for convert-base-1.0.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/convert-base/1.0.2/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] 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing convert-base-1.0.2 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-2/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/convert-base/1.0.2:/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] 46dcd95e6805c3a876be6847a80db61a8e45375235e0148470901f575b377feb
[INFO] running `"docker" "start" "-a" "46dcd95e6805c3a876be6847a80db61a8e45375235e0148470901f575b377feb"`
[INFO] [stderr]    Compiling convert-base v1.0.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `"docker" "inspect" "46dcd95e6805c3a876be6847a80db61a8e45375235e0148470901f575b377feb"`
[INFO] running `"docker" "rm" "-f" "46dcd95e6805c3a876be6847a80db61a8e45375235e0148470901f575b377feb"`
[INFO] [stdout] 46dcd95e6805c3a876be6847a80db61a8e45375235e0148470901f575b377feb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/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/convert-base/1.0.2:/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] af8cab6077cc4bc6cdb197aa51281a7b8e83d1609012bb53ff6e7f2229799b4e
[INFO] running `"docker" "start" "-a" "af8cab6077cc4bc6cdb197aa51281a7b8e83d1609012bb53ff6e7f2229799b4e"`
[INFO] [stderr]    Compiling convert-base v1.0.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> examples/perf.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(duration_float)]
[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 `convert-base`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "af8cab6077cc4bc6cdb197aa51281a7b8e83d1609012bb53ff6e7f2229799b4e"`
[INFO] running `"docker" "rm" "-f" "af8cab6077cc4bc6cdb197aa51281a7b8e83d1609012bb53ff6e7f2229799b4e"`
[INFO] [stdout] af8cab6077cc4bc6cdb197aa51281a7b8e83d1609012bb53ff6e7f2229799b4e