[INFO] cloning repository https://github.com/cg505/gethostkeys
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cg505/gethostkeys" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcg505%2Fgethostkeys", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcg505%2Fgethostkeys'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b76c2d8a0be0ad5dc5df730e0f177075c4b2816
[INFO] checking cg505/gethostkeys against master#dfd7b8d03fb93d0e03147d28b3be6d93260fa94d for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcg505%2Fgethostkeys" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cg505/gethostkeys on toolchain dfd7b8d03fb93d0e03147d28b3be6d93260fa94d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cg505/gethostkeys
[INFO] finished tweaking git repo https://github.com/cg505/gethostkeys
[INFO] tweaked toml for git repo https://github.com/cg505/gethostkeys written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/cg505/gethostkeys already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e4068cab1213b194e8717a89939d5fac151aa5ecca4dd2c71c8422d6121d31c
[INFO] running `Command { std: "docker" "start" "-a" "1e4068cab1213b194e8717a89939d5fac151aa5ecca4dd2c71c8422d6121d31c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e4068cab1213b194e8717a89939d5fac151aa5ecca4dd2c71c8422d6121d31c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e4068cab1213b194e8717a89939d5fac151aa5ecca4dd2c71c8422d6121d31c", kill_on_drop: false }`
[INFO] [stdout] 1e4068cab1213b194e8717a89939d5fac151aa5ecca4dd2c71c8422d6121d31c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+dfd7b8d03fb93d0e03147d28b3be6d93260fa94d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ee11153435ef952026098c7b8d10eb30e98e980b17e5a023f6ea163b106328db
[INFO] running `Command { std: "docker" "start" "-a" "ee11153435ef952026098c7b8d10eb30e98e980b17e5a023f6ea163b106328db", kill_on_drop: false }`
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling openssl-sys v0.9.40
[INFO] [stderr]    Compiling curl-sys v0.4.15
[INFO] [stderr]     Checking socket2 v0.3.8
[INFO] [stderr]     Checking dirs v1.0.4
[INFO] [stderr]     Checking curl v0.4.19
[INFO] [stderr]     Checking gethostkeys v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `dest` is never read
[INFO] [stdout]   --> src/main.rs:93:11
[INFO] [stdout]    |
[INFO] [stdout] 93 |         let mut dest = String::new();
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `dest` is never read
[INFO] [stdout]   --> src/main.rs:93:11
[INFO] [stdout]    |
[INFO] [stdout] 93 |         let mut dest = String::new();
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut file = match OpenOptions::new()
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:22:6
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut reader = BufReader::new(file);
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:13:6
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let mut file = match OpenOptions::new()
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:22:6
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let mut reader = BufReader::new(file);
[INFO] [stdout]    |         ----^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:46:6
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut file = match OpenOptions::new()
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:46:6
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut file = match OpenOptions::new()
[INFO] [stdout]    |         ----^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.41s
[INFO] running `Command { std: "docker" "inspect" "ee11153435ef952026098c7b8d10eb30e98e980b17e5a023f6ea163b106328db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee11153435ef952026098c7b8d10eb30e98e980b17e5a023f6ea163b106328db", kill_on_drop: false }`
[INFO] [stdout] ee11153435ef952026098c7b8d10eb30e98e980b17e5a023f6ea163b106328db