[INFO] updating cached repository jasobrown/polaris
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jasobrown/polaris
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jasobrown/polaris" "work/ex/beta-1.38-1/sources/1.37.0/gh/jasobrown/polaris"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jasobrown/polaris'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jasobrown/polaris" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jasobrown/polaris"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jasobrown/polaris'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c29c785e5efb071cbd84ccdf04a1db12fdf3691a
[INFO] sha for GitHub repo jasobrown/polaris: c29c785e5efb071cbd84ccdf04a1db12fdf3691a
[INFO] validating manifest of jasobrown/polaris 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 jasobrown/polaris 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 jasobrown/polaris
[INFO] finished frobbing jasobrown/polaris
[INFO] frobbed toml for jasobrown/polaris written to work/ex/beta-1.38-1/sources/1.37.0/gh/jasobrown/polaris/Cargo.toml
[INFO] started frobbing jasobrown/polaris
[INFO] finished frobbing jasobrown/polaris
[INFO] frobbed toml for jasobrown/polaris written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jasobrown/polaris/Cargo.toml
[INFO] crate jasobrown/polaris 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jasobrown/polaris/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing jasobrown/polaris against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jasobrown/polaris:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] aefc9092fbc5f17015d53fe5413d50e8c6c0536479a88f3a50b4260f2ac0634a
[INFO] running `"docker" "start" "-a" "aefc9092fbc5f17015d53fe5413d50e8c6c0536479a88f3a50b4260f2ac0634a"`
[INFO] [stderr]    Compiling log v0.2.5
[INFO] [stderr] error[E0425]: cannot find function `at_exit` in module `rt`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/log-0.2.5/src/lib.rs:535:9
[INFO] [stderr]     |
[INFO] [stderr] 535 |     rt::at_exit(|| {
[INFO] [stderr]     |         ^^^^^^^ not found in `rt`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/log-0.2.5/src/lib.rs:145:1
[INFO] [stderr]     |
[INFO] [stderr] 145 | #![feature(core, std_misc)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rt': this public module should not exist and is highly likely to disappear
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/log-0.2.5/src/lib.rs:153:5
[INFO] [stderr]     |
[INFO] [stderr] 153 | use std::rt;
[INFO] [stderr]     |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `log`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "aefc9092fbc5f17015d53fe5413d50e8c6c0536479a88f3a50b4260f2ac0634a"`
[INFO] running `"docker" "rm" "-f" "aefc9092fbc5f17015d53fe5413d50e8c6c0536479a88f3a50b4260f2ac0634a"`
[INFO] [stdout] aefc9092fbc5f17015d53fe5413d50e8c6c0536479a88f3a50b4260f2ac0634a