[INFO] crate v_hist 0.1.1 is already in cache
[INFO] extracting crate v_hist 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/v_hist/0.1.1
[INFO] extracting crate v_hist 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/v_hist/0.1.1
[INFO] validating manifest of v_hist-0.1.1 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 v_hist-0.1.1 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 v_hist-0.1.1
[INFO] finished frobbing v_hist-0.1.1
[INFO] frobbed toml for v_hist-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/v_hist/0.1.1/Cargo.toml
[INFO] started frobbing v_hist-0.1.1
[INFO] finished frobbing v_hist-0.1.1
[INFO] frobbed toml for v_hist-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/v_hist/0.1.1/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] [stderr]     Blocking waiting for file lock on package cache
[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] testing v_hist-0.1.1 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/reg/v_hist/0.1.1:/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] 9279379ba57b555bf26a1fa8bec7558646f1f4f89b0bed15922b712b5d45c5a7
[INFO] running `"docker" "start" "-a" "9279379ba57b555bf26a1fa8bec7558646f1f4f89b0bed15922b712b5d45c5a7"`
[INFO] [stderr]    Compiling termion v1.5.3
[INFO] [stderr]    Compiling v_hist v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:44:17
[INFO] [stderr]    |
[INFO] [stderr] 44 |             let mut s = format!("{label:>width$}", label=self.labels[x], width=self.label_len);
[INFO] [stderr]    |                 ----^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |         let mut s: String = format!("{:0width$}", x, width=num_digits);
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.37s
[INFO] running `"docker" "inspect" "9279379ba57b555bf26a1fa8bec7558646f1f4f89b0bed15922b712b5d45c5a7"`
[INFO] running `"docker" "rm" "-f" "9279379ba57b555bf26a1fa8bec7558646f1f4f89b0bed15922b712b5d45c5a7"`
[INFO] [stdout] 9279379ba57b555bf26a1fa8bec7558646f1f4f89b0bed15922b712b5d45c5a7
[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/reg/v_hist/0.1.1:/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] 242b28aae2289b38ba0ec8eb40b1b23f302d15b2e0820f2a8101566ef41dd8b0
[INFO] running `"docker" "start" "-a" "242b28aae2289b38ba0ec8eb40b1b23f302d15b2e0820f2a8101566ef41dd8b0"`
[INFO] [stderr]    Compiling v_hist v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:44:17
[INFO] [stderr]    |
[INFO] [stderr] 44 |             let mut s = format!("{label:>width$}", label=self.labels[x], width=self.label_len);
[INFO] [stderr]    |                 ----^
[INFO] [stderr]    |                 |
[INFO] [stderr]    |                 help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:69:13
[INFO] [stderr]    |
[INFO] [stderr] 69 |         let mut s: String = format!("{:0width$}", x, width=num_digits);
[INFO] [stderr]    |             ----^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `"docker" "inspect" "242b28aae2289b38ba0ec8eb40b1b23f302d15b2e0820f2a8101566ef41dd8b0"`
[INFO] running `"docker" "rm" "-f" "242b28aae2289b38ba0ec8eb40b1b23f302d15b2e0820f2a8101566ef41dd8b0"`
[INFO] [stdout] 242b28aae2289b38ba0ec8eb40b1b23f302d15b2e0820f2a8101566ef41dd8b0
[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/reg/v_hist/0.1.1:/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"`
[INFO] [stdout] 98e4d61d6bfb4e9fb465c05c862947f1b5d5a61107dbdc9d174939b4506b0eda
[INFO] running `"docker" "start" "-a" "98e4d61d6bfb4e9fb465c05c862947f1b5d5a61107dbdc9d174939b4506b0eda"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/v_hist-710b393e8e2fe3fb
[INFO] [stderr]      Running /opt/crater/target/debug/deps/v_hist-feba8d358ab915a8
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests v_hist
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "98e4d61d6bfb4e9fb465c05c862947f1b5d5a61107dbdc9d174939b4506b0eda"`
[INFO] running `"docker" "rm" "-f" "98e4d61d6bfb4e9fb465c05c862947f1b5d5a61107dbdc9d174939b4506b0eda"`
[INFO] [stdout] 98e4d61d6bfb4e9fb465c05c862947f1b5d5a61107dbdc9d174939b4506b0eda