[INFO] crate iryna 0.1.4 is already in cache
[INFO] extracting crate iryna 0.1.4 into work/ex/beta-1.38-1/sources/1.37.0/reg/iryna/0.1.4
[INFO] extracting crate iryna 0.1.4 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/iryna/0.1.4
[INFO] validating manifest of iryna-0.1.4 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 iryna-0.1.4 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 iryna-0.1.4
[INFO] finished frobbing iryna-0.1.4
[INFO] frobbed toml for iryna-0.1.4 written to work/ex/beta-1.38-1/sources/1.37.0/reg/iryna/0.1.4/Cargo.toml
[INFO] started frobbing iryna-0.1.4
[INFO] finished frobbing iryna-0.1.4
[INFO] frobbed toml for iryna-0.1.4 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/iryna/0.1.4/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] 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 iryna-0.1.4 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/reg/iryna/0.1.4:/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] 1095d0efcbcf8323dafbf2dc576c6c4713c0264040f54dd64917222f8b6a3fdf
[INFO] running `"docker" "start" "-a" "1095d0efcbcf8323dafbf2dc576c6c4713c0264040f54dd64917222f8b6a3fdf"`
[INFO] [stderr]    Compiling iryna v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(match_default_bindings)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::time::Duration`
[INFO] [stderr]  --> src/eventloop.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::time::Duration;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Read`, `Result`, `Write`
[INFO] [stderr]  --> src/eventloop.rs:4:15
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::io::{Read, Result, Write};
[INFO] [stderr]   |               ^^^^  ^^^^^^  ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `RwLock`
[INFO] [stderr]  --> src/eventloop.rs:6:22
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::sync::{Arc, RwLock};
[INFO] [stderr]   |                      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `acceptor::*`
[INFO] [stderr]  --> src/channel.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use acceptor::*;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `eventloop::*`
[INFO] [stderr]  --> src/channel.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use eventloop::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/channel.rs:12:24
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub type Closure = Box<Fn(&mut ChanCtx) + Send + Sync>;
[INFO] [stderr]    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut ChanCtx) + Send + Sync`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Mutex`, `RwLock`
[INFO] [stderr]  --> src/acceptor.rs:4:22
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::sync::{Arc, Mutex, RwLock};
[INFO] [stderr]   |                      ^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `IpAddr`
[INFO] [stderr]  --> src/acceptor.rs:5:16
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::net::{IpAddr, SocketAddr};
[INFO] [stderr]   |                ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Result`
[INFO] [stderr]  --> src/acceptor.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::{Result, Write};
[INFO] [stderr]   |               ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TcpStream`
[INFO] [stderr]  --> src/acceptor.rs:8:29
[INFO] [stderr]   |
[INFO] [stderr] 8 | use mio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                             ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Write`
[INFO] [stderr]  --> src/acceptor.rs:6:23
[INFO] [stderr]   |
[INFO] [stderr] 6 | use std::io::{Result, Write};
[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 `iryna`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1095d0efcbcf8323dafbf2dc576c6c4713c0264040f54dd64917222f8b6a3fdf"`
[INFO] running `"docker" "rm" "-f" "1095d0efcbcf8323dafbf2dc576c6c4713c0264040f54dd64917222f8b6a3fdf"`
[INFO] [stdout] 1095d0efcbcf8323dafbf2dc576c6c4713c0264040f54dd64917222f8b6a3fdf