Dec 18 01:23:04.737 INFO checking dgoetsch/glutton against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 01:23:04.737 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/dgoetsch/glutton:/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=forbid" "-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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 01:23:05.045 INFO [stdout] 135c39faae772ce96ac3061f3d137f5f4155e262d5c521b21b5c5e3d786c5cfb
Dec 18 01:23:05.047 INFO running `"docker" "start" "-a" "135c39faae772ce96ac3061f3d137f5f4155e262d5c521b21b5c5e3d786c5cfb"`
Dec 18 01:23:06.144 INFO [stderr]     Checking rust-by-ex v0.1.0 (/opt/crater/workdir)
Dec 18 01:23:06.432 INFO [stderr] warning: unused import: `std::iter::Map`
Dec 18 01:23:06.432 INFO [stderr]  --> src/main.rs:6:5
Dec 18 01:23:06.432 INFO [stderr]   |
Dec 18 01:23:06.432 INFO [stderr] 6 | use std::iter::Map;
Dec 18 01:23:06.432 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 18 01:23:06.432 INFO [stderr]   |
Dec 18 01:23:06.432 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 01:23:06.432 INFO [stderr] 
Dec 18 01:23:06.432 INFO [stderr] warning: unnecessary parentheses around `for` head expression
Dec 18 01:23:06.432 INFO [stderr]   --> src/main.rs:18:21
Dec 18 01:23:06.432 INFO [stderr]    |
Dec 18 01:23:06.432 INFO [stderr] 18 |         for idx in  (0..self.at_a_time) {
Dec 18 01:23:06.432 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
Dec 18 01:23:06.432 INFO [stderr]    |
Dec 18 01:23:06.432 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 18 01:23:06.432 INFO [stderr] 
Dec 18 01:23:06.444 INFO [stderr] warning: unused import: `std::iter::Map`
Dec 18 01:23:06.444 INFO [stderr]  --> src/main.rs:6:5
Dec 18 01:23:06.444 INFO [stderr]   |
Dec 18 01:23:06.444 INFO [stderr] 6 | use std::iter::Map;
Dec 18 01:23:06.444 INFO [stderr]   |     ^^^^^^^^^^^^^^
Dec 18 01:23:06.444 INFO [stderr]   |
Dec 18 01:23:06.444 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 01:23:06.444 INFO [stderr] 
Dec 18 01:23:06.444 INFO [stderr] warning: unnecessary parentheses around `for` head expression
Dec 18 01:23:06.444 INFO [stderr]   --> src/main.rs:18:21
Dec 18 01:23:06.444 INFO [stderr]    |
Dec 18 01:23:06.444 INFO [stderr] 18 |         for idx in  (0..self.at_a_time) {
Dec 18 01:23:06.444 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
Dec 18 01:23:06.444 INFO [stderr]    |
Dec 18 01:23:06.444 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 18 01:23:06.444 INFO [stderr] 
Dec 18 01:23:06.452 INFO [stderr] warning: use of deprecated item 'rand::Rng::gen_ascii_chars': use sample_iter(&Alphanumeric) instead
Dec 18 01:23:06.452 INFO [stderr]   --> src/main.rs:32:33
Dec 18 01:23:06.452 INFO [stderr]    |
Dec 18 01:23:06.452 INFO [stderr] 32 |         let name = thread_rng().gen_ascii_chars().take(10) .collect::<String>();
Dec 18 01:23:06.452 INFO [stderr]    |                                 ^^^^^^^^^^^^^^^
Dec 18 01:23:06.452 INFO [stderr]    |
Dec 18 01:23:06.452 INFO [stderr]    = note: #[warn(deprecated)] on by default
Dec 18 01:23:06.452 INFO [stderr] 
Dec 18 01:23:06.472 INFO [stderr] warning: unused variable: `idx`
Dec 18 01:23:06.472 INFO [stderr]   --> src/main.rs:18:13
Dec 18 01:23:06.472 INFO [stderr]    |
Dec 18 01:23:06.472 INFO [stderr] 18 |         for idx in  (0..self.at_a_time) {
Dec 18 01:23:06.472 INFO [stderr]    |             ^^^ help: consider using `_idx` instead
Dec 18 01:23:06.472 INFO [stderr]    |
Dec 18 01:23:06.472 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 01:23:06.472 INFO [stderr] 
Dec 18 01:23:06.472 INFO [stderr] warning: unused variable: `cd_res`
Dec 18 01:23:06.472 INFO [stderr]   --> src/main.rs:38:13
Dec 18 01:23:06.472 INFO [stderr]    |
Dec 18 01:23:06.472 INFO [stderr] 38 |         let cd_res = std::fs::create_dir_all(sub_dir.as_str());
Dec 18 01:23:06.472 INFO [stderr]    |             ^^^^^^ help: consider using `_cd_res` instead
Dec 18 01:23:06.472 INFO [stderr] 
Dec 18 01:23:06.473 INFO [stderr] warning: unused variable: `cf_res`
Dec 18 01:23:06.473 INFO [stderr]   --> src/main.rs:46:13
Dec 18 01:23:06.473 INFO [stderr]    |
Dec 18 01:23:06.473 INFO [stderr] 46 |         let cf_res = std::fs::File::create(file_name.as_str())
Dec 18 01:23:06.473 INFO [stderr]    |             ^^^^^^ help: consider using `_cf_res` instead
Dec 18 01:23:06.473 INFO [stderr] 
Dec 18 01:23:06.480 INFO [stderr] warning: use of deprecated item 'rand::Rng::gen_ascii_chars': use sample_iter(&Alphanumeric) instead
Dec 18 01:23:06.480 INFO [stderr]   --> src/main.rs:32:33
Dec 18 01:23:06.480 INFO [stderr]    |
Dec 18 01:23:06.480 INFO [stderr] 32 |         let name = thread_rng().gen_ascii_chars().take(10) .collect::<String>();
Dec 18 01:23:06.480 INFO [stderr]    |                                 ^^^^^^^^^^^^^^^
Dec 18 01:23:06.480 INFO [stderr]    |
Dec 18 01:23:06.480 INFO [stderr]    = note: #[warn(deprecated)] on by default
Dec 18 01:23:06.480 INFO [stderr] 
Dec 18 01:23:06.480 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 01:23:06.480 INFO [stderr]   --> src/main.rs:23:13
Dec 18 01:23:06.480 INFO [stderr]    |
Dec 18 01:23:06.480 INFO [stderr] 23 |             handler.join();
Dec 18 01:23:06.480 INFO [stderr]    |             ^^^^^^^^^^^^^^^
Dec 18 01:23:06.480 INFO [stderr]    |
Dec 18 01:23:06.480 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 01:23:06.480 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 01:23:06.480 INFO [stderr] 
Dec 18 01:23:06.500 INFO [stderr] warning: unused variable: `idx`
Dec 18 01:23:06.500 INFO [stderr]   --> src/main.rs:18:13
Dec 18 01:23:06.500 INFO [stderr]    |
Dec 18 01:23:06.500 INFO [stderr] 18 |         for idx in  (0..self.at_a_time) {
Dec 18 01:23:06.500 INFO [stderr]    |             ^^^ help: consider using `_idx` instead
Dec 18 01:23:06.500 INFO [stderr]    |
Dec 18 01:23:06.500 INFO [stderr]    = note: #[warn(unused_variables)] on by default
Dec 18 01:23:06.500 INFO [stderr] 
Dec 18 01:23:06.500 INFO [stderr] warning: unused variable: `cd_res`
Dec 18 01:23:06.500 INFO [stderr]   --> src/main.rs:38:13
Dec 18 01:23:06.500 INFO [stderr]    |
Dec 18 01:23:06.500 INFO [stderr] 38 |         let cd_res = std::fs::create_dir_all(sub_dir.as_str());
Dec 18 01:23:06.500 INFO [stderr]    |             ^^^^^^ help: consider using `_cd_res` instead
Dec 18 01:23:06.500 INFO [stderr] 
Dec 18 01:23:06.500 INFO [stderr] warning: unused variable: `cf_res`
Dec 18 01:23:06.500 INFO [stderr]   --> src/main.rs:46:13
Dec 18 01:23:06.500 INFO [stderr]    |
Dec 18 01:23:06.500 INFO [stderr] 46 |         let cf_res = std::fs::File::create(file_name.as_str())
Dec 18 01:23:06.501 INFO [stderr]    |             ^^^^^^ help: consider using `_cf_res` instead
Dec 18 01:23:06.501 INFO [stderr] 
Dec 18 01:23:06.508 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 01:23:06.508 INFO [stderr]   --> src/main.rs:23:13
Dec 18 01:23:06.509 INFO [stderr]    |
Dec 18 01:23:06.509 INFO [stderr] 23 |             handler.join();
Dec 18 01:23:06.509 INFO [stderr]    |             ^^^^^^^^^^^^^^^
Dec 18 01:23:06.509 INFO [stderr]    |
Dec 18 01:23:06.509 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 01:23:06.509 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 01:23:06.509 INFO [stderr] 
Dec 18 01:23:06.524 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.40s
Dec 18 01:23:06.873 INFO running `"docker" "inspect" "135c39faae772ce96ac3061f3d137f5f4155e262d5c521b21b5c5e3d786c5cfb"`
Dec 18 01:23:06.973 INFO running `"docker" "rm" "-f" "135c39faae772ce96ac3061f3d137f5f4155e262d5c521b21b5c5e3d786c5cfb"`
Dec 18 01:23:07.154 INFO [stdout] 135c39faae772ce96ac3061f3d137f5f4155e262d5c521b21b5c5e3d786c5cfb