[INFO] updating cached repository https://github.com/3541/bt
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5fd7a61201e34f1a7e0a9ea237cdc54f1129fb1f
[INFO] testing 3541/bt against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F3541%2Fbt" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/3541/bt on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/3541/bt
[INFO] finished tweaking git repo https://github.com/3541/bt
[INFO] tweaked toml for git repo https://github.com/3541/bt written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/3541/bt already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stdout] d2607f77898c987d43e66f44f64143652a722dcd30abf4d68d1c9968c2f2e6b4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "d2607f77898c987d43e66f44f64143652a722dcd30abf4d68d1c9968c2f2e6b4"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling bt v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(core_intrinsics)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/torrent/bencode/mod.rs:46:25
[INFO] [stderr]    |
[INFO] [stderr] 46 |                 x @ '0' ... '9' => { acc.push(x 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/torrent/bencode/mod.rs:82:21
[INFO] [stderr]    |
[INFO] [stderr] 82 |                 '0' ... '9' => { ret.push(match ByteString::from_string((&text[i..]).to_vec()) { Ok((x, n)) => { i += n; len += n; x }, Err(e) => { return Err(e) } }); },
[INFO] [stderr]    |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/torrent/bencode/mod.rs:103:24
[INFO] [stderr]     |
[INFO] [stderr] 103 |             if let '0' ... '9' = text[i] as char {} else { return Err(format!("Malformed key field. Keys must be bencode strings. Unexpected character {:?}", text[i] as char)); }
[INFO] [stderr]     |                        ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/torrent/bencode/mod.rs:120:21
[INFO] [stderr]     |
[INFO] [stderr] 120 |                 '0' ... '9' => { match ByteString::from_string((&text[i..]).to_vec()) { Ok((x, n)) => { i += n; len += n; x}, Err(e) => { return Err(e) }, } },
[INFO] [stderr]     |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/torrent/bencode/mod.rs:140:16
[INFO] [stderr]     |
[INFO] [stderr] 140 |     if let '0' ... '9' = text[0] as char {} else { return Err("Malformed number.".to_string()); }
[INFO] [stderr]     |                ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]    --> src/torrent/bencode/mod.rs:155:9
[INFO] [stderr]     |
[INFO] [stderr] 155 |     use super::*;
[INFO] [stderr]     |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]    --> src/torrent/bencode/mod.rs:156:9
[INFO] [stderr]     |
[INFO] [stderr] 156 |     use std::fs::File;
[INFO] [stderr]     |         ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::prelude::*`
[INFO] [stderr]    --> src/torrent/bencode/mod.rs:157:9
[INFO] [stderr]     |
[INFO] [stderr] 157 |     use std::io::prelude::*;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io`
[INFO] [stderr]  --> src/torrent/mod.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::io;
[INFO] [stderr]   |     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 10 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `bt`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d2607f77898c987d43e66f44f64143652a722dcd30abf4d68d1c9968c2f2e6b4"`
[INFO] running `"docker" "rm" "-f" "d2607f77898c987d43e66f44f64143652a722dcd30abf4d68d1c9968c2f2e6b4"`
[INFO] [stdout] d2607f77898c987d43e66f44f64143652a722dcd30abf4d68d1c9968c2f2e6b4