[INFO] updating cached repository darkwater/um
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/darkwater/um
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/darkwater/um" "work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/gh/darkwater/um"`
[INFO] [stderr] Cloning into 'work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/gh/darkwater/um'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/darkwater/um" "work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/darkwater/um"`
[INFO] [stderr] Cloning into 'work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/darkwater/um'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 290006bff8a85d175e37e16f89eb0fa19b9114ad
[INFO] sha for GitHub repo darkwater/um: 290006bff8a85d175e37e16f89eb0fa19b9114ad
[INFO] validating manifest of darkwater/um on toolchain master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of darkwater/um on toolchain try#bad365140e1e8233b42b21af70a407f14ce5fec5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing darkwater/um
[INFO] finished frobbing darkwater/um
[INFO] frobbed toml for darkwater/um written to work/ex/pr-56896/sources/master#adbfec229ce07ff4b2a7bf2d6dec2d13cb224980/gh/darkwater/um/Cargo.toml
[INFO] started frobbing darkwater/um
[INFO] finished frobbing darkwater/um
[INFO] frobbed toml for darkwater/um written to work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/darkwater/um/Cargo.toml
[INFO] crate darkwater/um has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+adbfec229ce07ff4b2a7bf2d6dec2d13cb224980-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking darkwater/um against try#bad365140e1e8233b42b21af70a407f14ce5fec5 for pr-56896
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56896/worker-5/try#bad365140e1e8233b42b21af70a407f14ce5fec5:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56896/sources/try#bad365140e1e8233b42b21af70a407f14ce5fec5/gh/darkwater/um:/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" "+bad365140e1e8233b42b21af70a407f14ce5fec5-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 196154d2efd3fafdd44d32fafcbe1c6a01060028d493e084d3d63580aca7b65a
[INFO] running `"docker" "start" "-a" "196154d2efd3fafdd44d32fafcbe1c6a01060028d493e084d3d63580aca7b65a"`
[INFO] [stderr]     Checking um v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `TcpListener`
[INFO] [stderr]  --> src/client.rs:7:18
[INFO] [stderr]   |
[INFO] [stderr] 7 | use tokio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                  ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BufMut`
[INFO] [stderr]  --> src/commandcodec.rs:1:13
[INFO] [stderr]   |
[INFO] [stderr] 1 | use bytes::{BufMut, BytesMut};
[INFO] [stderr]   |             ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::Write`
[INFO] [stderr]  --> src/commandcodec.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::io`
[INFO] [stderr]  --> src/server.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use tokio::io;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TcpListener`
[INFO] [stderr]  --> src/client.rs:7:18
[INFO] [stderr]   |
[INFO] [stderr] 7 | use tokio::net::{TcpListener, TcpStream};
[INFO] [stderr]   |                  ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BufMut`
[INFO] [stderr]  --> src/commandcodec.rs:1:13
[INFO] [stderr]   |
[INFO] [stderr] 1 | use bytes::{BufMut, BytesMut};
[INFO] [stderr]   |             ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fmt::Write`
[INFO] [stderr]  --> src/commandcodec.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::fmt::Write;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/node.rs:46:9
[INFO] [stderr]    |
[INFO] [stderr] 46 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `tokio::io`
[INFO] [stderr]  --> src/server.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use tokio::io;
[INFO] [stderr]   |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/server.rs:54:9
[INFO] [stderr]    |
[INFO] [stderr] 54 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::std::io::prelude::*`
[INFO] [stderr]   --> src/server.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |     use ::std::io::prelude::*;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `::std::net::TcpStream`
[INFO] [stderr]   --> src/server.rs:56:9
[INFO] [stderr]    |
[INFO] [stderr] 56 |     use ::std::net::TcpStream;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `super::*`
[INFO] [stderr]   --> src/value.rs:83:9
[INFO] [stderr]    |
[INFO] [stderr] 83 |     use super::*;
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_err`
[INFO] [stderr]   --> src/response.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     pub fn is_err(&self) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `match_default_bindings` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(match_default_bindings, nll, option_filter, try_trait)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `option_filter` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:41
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(match_default_bindings, nll, option_filter, try_trait)]
[INFO] [stderr]   |                                         ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `match_default_bindings` has been stable since 1.26.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(match_default_bindings, nll, option_filter, try_trait)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `option_filter` has been stable since 1.27.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/main.rs:1:41
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(match_default_bindings, nll, option_filter, try_trait)]
[INFO] [stderr]   |                                         ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.19s
[INFO] running `"docker" "inspect" "196154d2efd3fafdd44d32fafcbe1c6a01060028d493e084d3d63580aca7b65a"`
[INFO] running `"docker" "rm" "-f" "196154d2efd3fafdd44d32fafcbe1c6a01060028d493e084d3d63580aca7b65a"`
[INFO] [stdout] 196154d2efd3fafdd44d32fafcbe1c6a01060028d493e084d3d63580aca7b65a