[INFO] updating cached repository hatoo/read_to_char_vec_benchmark
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/hatoo/read_to_char_vec_benchmark
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/hatoo/read_to_char_vec_benchmark" "work/ex/beta-1.38-1/sources/1.37.0/gh/hatoo/read_to_char_vec_benchmark"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/hatoo/read_to_char_vec_benchmark'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/hatoo/read_to_char_vec_benchmark" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hatoo/read_to_char_vec_benchmark"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hatoo/read_to_char_vec_benchmark'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e19edd599c357569e1306c30e462405456289f9b
[INFO] sha for GitHub repo hatoo/read_to_char_vec_benchmark: e19edd599c357569e1306c30e462405456289f9b
[INFO] validating manifest of hatoo/read_to_char_vec_benchmark 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 hatoo/read_to_char_vec_benchmark 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 hatoo/read_to_char_vec_benchmark
[INFO] finished frobbing hatoo/read_to_char_vec_benchmark
[INFO] frobbed toml for hatoo/read_to_char_vec_benchmark written to work/ex/beta-1.38-1/sources/1.37.0/gh/hatoo/read_to_char_vec_benchmark/Cargo.toml
[INFO] started frobbing hatoo/read_to_char_vec_benchmark
[INFO] finished frobbing hatoo/read_to_char_vec_benchmark
[INFO] frobbed toml for hatoo/read_to_char_vec_benchmark written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hatoo/read_to_char_vec_benchmark/Cargo.toml
[INFO] crate hatoo/read_to_char_vec_benchmark 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 hatoo/read_to_char_vec_benchmark 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/hatoo/read_to_char_vec_benchmark:/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] 959ea14e3b23c950b5b2f70a77ca156916415875499b746afb8e1957ae844833
[INFO] running `"docker" "start" "-a" "959ea14e3b23c950b5b2f70a77ca156916415875499b746afb8e1957ae844833"`
[INFO] [stderr]    Compiling ropey v1.0.0
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling read_to_char_vec_benchmark v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::fs;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::BufRead`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io::BufRead;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::BufReader`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::io::BufReader;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/main.rs:97:25
[INFO] [stderr]    |
[INFO] [stderr] 97 |             0b_0000_0000...0b_0111_1111 => Some(Ok(buf[0] as char)),
[INFO] [stderr]    |                         ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(ellipsis_inclusive_range_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/main.rs:98:25
[INFO] [stderr]    |
[INFO] [stderr] 98 |             0b_1100_0000...0b_1101_1111 => self.to_utf8_char(&mut buf, 1),
[INFO] [stderr]    |                         ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/main.rs:99:25
[INFO] [stderr]    |
[INFO] [stderr] 99 |             0b_1110_0000...0b_1110_1111 => self.to_utf8_char(&mut buf, 2),
[INFO] [stderr]    |                         ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/main.rs:100:25
[INFO] [stderr]     |
[INFO] [stderr] 100 |             0b_1111_0000...0b_1111_0111 => self.to_utf8_char(&mut buf, 3),
[INFO] [stderr]     |                         ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rayon::prelude`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use rayon::prelude::*;
[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 `read_to_char_vec_benchmark`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "959ea14e3b23c950b5b2f70a77ca156916415875499b746afb8e1957ae844833"`
[INFO] running `"docker" "rm" "-f" "959ea14e3b23c950b5b2f70a77ca156916415875499b746afb8e1957ae844833"`
[INFO] [stdout] 959ea14e3b23c950b5b2f70a77ca156916415875499b746afb8e1957ae844833