[INFO] crate convert-base 1.0.2 is already in cache
[INFO] testing convert-base-1.0.2 against 1.38.0 for beta-1.39-1
[INFO] extracting crate convert-base 1.0.2 into work/builds/worker-0/source
[INFO] validating manifest of crates.io crate convert-base 1.0.2 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate convert-base 1.0.2
[INFO] finished tweaking crates.io crate convert-base 1.0.2
[INFO] tweaked toml for crates.io crate convert-base 1.0.2 written to work/builds/worker-0/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] af0aebf68f38379c1380bd3a113b5bbfa5bedb181ea71465cd1c7fad4b7688d1
[INFO] running `"docker" "start" "-a" "af0aebf68f38379c1380bd3a113b5bbfa5bedb181ea71465cd1c7fad4b7688d1"`
[INFO] [stderr]    Compiling convert-base v1.0.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `"docker" "inspect" "af0aebf68f38379c1380bd3a113b5bbfa5bedb181ea71465cd1c7fad4b7688d1"`
[INFO] running `"docker" "rm" "-f" "af0aebf68f38379c1380bd3a113b5bbfa5bedb181ea71465cd1c7fad4b7688d1"`
[INFO] [stdout] af0aebf68f38379c1380bd3a113b5bbfa5bedb181ea71465cd1c7fad4b7688d1
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] f7a4ad24bb27c6fdad493895d58a9c2600153380c728bc40a0de6386eae7349f
[INFO] running `"docker" "start" "-a" "f7a4ad24bb27c6fdad493895d58a9c2600153380c728bc40a0de6386eae7349f"`
[INFO] [stderr]    Compiling convert-base v1.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable 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" "f7a4ad24bb27c6fdad493895d58a9c2600153380c728bc40a0de6386eae7349f"`
[INFO] running `"docker" "rm" "-f" "f7a4ad24bb27c6fdad493895d58a9c2600153380c728bc40a0de6386eae7349f"`
[INFO] [stdout] f7a4ad24bb27c6fdad493895d58a9c2600153380c728bc40a0de6386eae7349f