[INFO] crate float_fast_print 0.1.2 is already in cache
[INFO] extracting crate float_fast_print 0.1.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/float_fast_print/0.1.2
[INFO] extracting crate float_fast_print 0.1.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/float_fast_print/0.1.2
[INFO] validating manifest of float_fast_print-0.1.2 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of float_fast_print-0.1.2 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing float_fast_print-0.1.2
[INFO] finished frobbing float_fast_print-0.1.2
[INFO] frobbed toml for float_fast_print-0.1.2 written to work/ex/beta-1.37-6/sources/1.36.0/reg/float_fast_print/0.1.2/Cargo.toml
[INFO] started frobbing float_fast_print-0.1.2
[INFO] finished frobbing float_fast_print-0.1.2
[INFO] frobbed toml for float_fast_print-0.1.2 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/float_fast_print/0.1.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing float_fast_print-0.1.2 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/float_fast_print/0.1.2:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 4ded71a2fc40a8bbb5df19509028e83798b7ee1b732c3050caa5af8bc542a8cf
[INFO] running `"docker" "start" "-a" "4ded71a2fc40a8bbb5df19509028e83798b7ee1b732c3050caa5af8bc542a8cf"`
[INFO] [stderr]    Compiling float_fast_print v0.1.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `"docker" "inspect" "4ded71a2fc40a8bbb5df19509028e83798b7ee1b732c3050caa5af8bc542a8cf"`
[INFO] running `"docker" "rm" "-f" "4ded71a2fc40a8bbb5df19509028e83798b7ee1b732c3050caa5af8bc542a8cf"`
[INFO] [stdout] 4ded71a2fc40a8bbb5df19509028e83798b7ee1b732c3050caa5af8bc542a8cf
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/float_fast_print/0.1.2:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 812856d2fd0d96e5b0e6c49b5154947ea4ad6a4120dae75b1e21ce06cbd447fd
[INFO] running `"docker" "start" "-a" "812856d2fd0d96e5b0e6c49b5154947ea4ad6a4120dae75b1e21ce06cbd447fd"`
[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" "812856d2fd0d96e5b0e6c49b5154947ea4ad6a4120dae75b1e21ce06cbd447fd"`
[INFO] running `"docker" "rm" "-f" "812856d2fd0d96e5b0e6c49b5154947ea4ad6a4120dae75b1e21ce06cbd447fd"`
[INFO] [stdout] 812856d2fd0d96e5b0e6c49b5154947ea4ad6a4120dae75b1e21ce06cbd447fd