[INFO] crate icefalldb 0.1.0 is already in cache
[INFO] extracting crate icefalldb 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/icefalldb/0.1.0
[INFO] extracting crate icefalldb 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/icefalldb/0.1.0
[INFO] validating manifest of icefalldb-0.1.0 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 icefalldb-0.1.0 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 icefalldb-0.1.0
[INFO] removed 0 missing tests
[INFO] finished frobbing icefalldb-0.1.0
[INFO] frobbed toml for icefalldb-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/icefalldb/0.1.0/Cargo.toml
[INFO] started frobbing icefalldb-0.1.0
[INFO] removed 0 missing tests
[INFO] finished frobbing icefalldb-0.1.0
[INFO] frobbed toml for icefalldb-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/icefalldb/0.1.0/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 icefalldb-0.1.0 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/icefalldb/0.1.0:/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] 3ca55e2af7f5b79fd16c0c88ea366026753cc1d4386e25a74df5a526c555c366
[INFO] running `"docker" "start" "-a" "3ca55e2af7f5b79fd16c0c88ea366026753cc1d4386e25a74df5a526c555c366"`
[INFO] [stderr]    Compiling bincode v0.6.1
[INFO] [stderr]    Compiling icefalldb v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/log.rs:319:13
[INFO] [stderr]     |
[INFO] [stderr] 319 |         let mut out_buf = unsafe { (*self.buf.get()).as_mut_slice() };
[INFO] [stderr]     |             ----^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.91s
[INFO] running `"docker" "inspect" "3ca55e2af7f5b79fd16c0c88ea366026753cc1d4386e25a74df5a526c555c366"`
[INFO] running `"docker" "rm" "-f" "3ca55e2af7f5b79fd16c0c88ea366026753cc1d4386e25a74df5a526c555c366"`
[INFO] [stdout] 3ca55e2af7f5b79fd16c0c88ea366026753cc1d4386e25a74df5a526c555c366
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/icefalldb/0.1.0:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] c81d35d5543e8f876f48d0615c23bc0e7ea26e3a97fff4e2933e3ce81c6dbed2
[INFO] running `"docker" "start" "-a" "c81d35d5543e8f876f48d0615c23bc0e7ea26e3a97fff4e2933e3ce81c6dbed2"`
[INFO] [stderr]    Compiling icefalldb v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `rsdb`
[INFO] [stderr]  --> test/test.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | extern crate rsdb;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `icefalldb`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/log.rs:319:13
[INFO] [stderr]     |
[INFO] [stderr] 319 |         let mut out_buf = unsafe { (*self.buf.get()).as_mut_slice() };
[INFO] [stderr]     |             ----^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c81d35d5543e8f876f48d0615c23bc0e7ea26e3a97fff4e2933e3ce81c6dbed2"`
[INFO] running `"docker" "rm" "-f" "c81d35d5543e8f876f48d0615c23bc0e7ea26e3a97fff4e2933e3ce81c6dbed2"`
[INFO] [stdout] c81d35d5543e8f876f48d0615c23bc0e7ea26e3a97fff4e2933e3ce81c6dbed2