[INFO] updating cached repository mythmon/rearguard
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mythmon/rearguard
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mythmon/rearguard" "work/ex/beta-1.38-1/sources/1.37.0/gh/mythmon/rearguard"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mythmon/rearguard'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mythmon/rearguard" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mythmon/rearguard"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mythmon/rearguard'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7fde477fcbc072af8d710874018045a6a1793903
[INFO] sha for GitHub repo mythmon/rearguard: 7fde477fcbc072af8d710874018045a6a1793903
[INFO] validating manifest of mythmon/rearguard 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 mythmon/rearguard 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 mythmon/rearguard
[INFO] finished frobbing mythmon/rearguard
[INFO] frobbed toml for mythmon/rearguard written to work/ex/beta-1.38-1/sources/1.37.0/gh/mythmon/rearguard/Cargo.toml
[INFO] started frobbing mythmon/rearguard
[INFO] finished frobbing mythmon/rearguard
[INFO] frobbed toml for mythmon/rearguard written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mythmon/rearguard/Cargo.toml
[INFO] crate mythmon/rearguard 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 mythmon/rearguard against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mythmon/rearguard:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] be5e8cff73601b0e8f1d112e44af18b0abfe2ed7c3538830b664fb47f60b444d
[INFO] running `"docker" "start" "-a" "be5e8cff73601b0e8f1d112e44af18b0abfe2ed7c3538830b664fb47f60b444d"`
[INFO] [stderr]    Compiling rearguard v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: cannot find macro `select!` in this scope
[INFO] [stderr]   --> src/main.rs:28:9
[INFO] [stderr]    |
[INFO] [stderr] 28 |         select! (
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find macro `select!` in this scope
[INFO] [stderr]   --> src/main.rs:89:9
[INFO] [stderr]    |
[INFO] [stderr] 89 |         select! (
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(plugin)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(std_misc)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/main.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     println!("{}: disconnected.", client_addr);
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::str::<impl str>::trim_right_matches': superseded by `trim_end_matches`
[INFO] [stderr]   --> src/message.rs:63:34
[INFO] [stderr]    |
[INFO] [stderr] 63 |         let words: Vec<&str> = s.trim_right_matches("\r").split(" ").collect();
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated item: `trim_end_matches`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_chars` found for type `&str` in the current scope
[INFO] [stderr]   --> src/message.rs:66:34
[INFO] [stderr]    |
[INFO] [stderr] 66 |         let prefix = if words[i].slice_chars(0, 1) == ":" {
[INFO] [stderr]    |                                  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_chars` found for type `&str` in the current scope
[INFO] [stderr]   --> src/message.rs:68:31
[INFO] [stderr]    |
[INFO] [stderr] 68 |             Some(words[i - 1].slice_chars(1, words[i - 1].len()).to_string())
[INFO] [stderr]    |                               ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_chars` found for type `&str` in the current scope
[INFO] [stderr]   --> src/message.rs:80:25
[INFO] [stderr]    |
[INFO] [stderr] 80 |             if words[i].slice_chars(0, 1) == ":" {
[INFO] [stderr]    |                         ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_chars` found for type `&str` in the current scope
[INFO] [stderr]   --> src/message.rs:81:48
[INFO] [stderr]    |
[INFO] [stderr] 81 |                 let mut trail_parts = words[i].slice_chars(1, words[i].len()).to_string();
[INFO] [stderr]    |                                                ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 9 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rearguard`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "be5e8cff73601b0e8f1d112e44af18b0abfe2ed7c3538830b664fb47f60b444d"`
[INFO] running `"docker" "rm" "-f" "be5e8cff73601b0e8f1d112e44af18b0abfe2ed7c3538830b664fb47f60b444d"`
[INFO] [stdout] be5e8cff73601b0e8f1d112e44af18b0abfe2ed7c3538830b664fb47f60b444d