[INFO] updating cached repository peter-bertok/float_fast_print
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/peter-bertok/float_fast_print
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/peter-bertok/float_fast_print" "work/ex/beta-1.38-1/sources/1.37.0/gh/peter-bertok/float_fast_print"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/peter-bertok/float_fast_print'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/peter-bertok/float_fast_print" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/peter-bertok/float_fast_print"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/peter-bertok/float_fast_print'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6bb467250096f008c354de08c69f3325d9d03e0a
[INFO] sha for GitHub repo peter-bertok/float_fast_print: 6bb467250096f008c354de08c69f3325d9d03e0a
[INFO] validating manifest of peter-bertok/float_fast_print 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 peter-bertok/float_fast_print 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 peter-bertok/float_fast_print
[INFO] finished frobbing peter-bertok/float_fast_print
[INFO] frobbed toml for peter-bertok/float_fast_print written to work/ex/beta-1.38-1/sources/1.37.0/gh/peter-bertok/float_fast_print/Cargo.toml
[INFO] started frobbing peter-bertok/float_fast_print
[INFO] finished frobbing peter-bertok/float_fast_print
[INFO] frobbed toml for peter-bertok/float_fast_print written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/peter-bertok/float_fast_print/Cargo.toml
[INFO] crate peter-bertok/float_fast_print 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 peter-bertok/float_fast_print 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-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/peter-bertok/float_fast_print:/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] 66aef79cc7445708b9156c74cfc1a759df8dd51abec241daa3d2a48d371d5736
[INFO] running `"docker" "start" "-a" "66aef79cc7445708b9156c74cfc1a759df8dd51abec241daa3d2a48d371d5736"`
[INFO] [stderr]    Compiling float_fast_print v0.1.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.61s
[INFO] running `"docker" "inspect" "66aef79cc7445708b9156c74cfc1a759df8dd51abec241daa3d2a48d371d5736"`
[INFO] running `"docker" "rm" "-f" "66aef79cc7445708b9156c74cfc1a759df8dd51abec241daa3d2a48d371d5736"`
[INFO] [stdout] 66aef79cc7445708b9156c74cfc1a759df8dd51abec241daa3d2a48d371d5736
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/peter-bertok/float_fast_print:/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] 6304c72ee4c3b47ee24cc9d369e371c274f0d3a4f6b03a105f46ee399fc0eee7
[INFO] running `"docker" "start" "-a" "6304c72ee4c3b47ee24cc9d369e371c274f0d3a4f6b03a105f46ee399fc0eee7"`
[INFO] [stderr]    Compiling float_fast_print v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> tests/benchmarks.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 `float_fast_print`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> tests/exhaustive.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 `float_fast_print`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "6304c72ee4c3b47ee24cc9d369e371c274f0d3a4f6b03a105f46ee399fc0eee7"`
[INFO] running `"docker" "rm" "-f" "6304c72ee4c3b47ee24cc9d369e371c274f0d3a4f6b03a105f46ee399fc0eee7"`
[INFO] [stdout] 6304c72ee4c3b47ee24cc9d369e371c274f0d3a4f6b03a105f46ee399fc0eee7