[INFO] cloning repository https://github.com/enosuity/fearless-concurrency
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/enosuity/fearless-concurrency" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fenosuity%2Ffearless-concurrency", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fenosuity%2Ffearless-concurrency'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b4e39bc55aa1ad1c03cd87d47213deb2c58dc603
[INFO] checking enosuity/fearless-concurrency against master#2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48 for pr-142723
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fenosuity%2Ffearless-concurrency" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/enosuity/fearless-concurrency on toolchain 2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/enosuity/fearless-concurrency
[INFO] finished tweaking git repo https://github.com/enosuity/fearless-concurrency
[INFO] tweaked toml for git repo https://github.com/enosuity/fearless-concurrency written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/enosuity/fearless-concurrency already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: /workspace/builds/worker-1-tc1/source/Cargo.toml: unused manifest key: dependencies.performance-considerations.default
[INFO] [stderr] warning: /workspace/builds/worker-1-tc1/source/Cargo.toml: unused manifest key: dependencies.singleton-wrapper.default
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fe9922ddc7b4c1b2d84e8829e0442e23dfb95174abff10020b5779ef30a684da
[INFO] running `Command { std: "docker" "start" "-a" "fe9922ddc7b4c1b2d84e8829e0442e23dfb95174abff10020b5779ef30a684da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fe9922ddc7b4c1b2d84e8829e0442e23dfb95174abff10020b5779ef30a684da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe9922ddc7b4c1b2d84e8829e0442e23dfb95174abff10020b5779ef30a684da", kill_on_drop: false }`
[INFO] [stdout] fe9922ddc7b4c1b2d84e8829e0442e23dfb95174abff10020b5779ef30a684da
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "RUSTDOCFLAGS=--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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+2fcf1776b9ccef89993dfe40e9f5c4908e2d2d48" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d10b16653b193487f06f541e52061edbbddc5ce767cdd916ea8b8ba4d7a2d8d6
[INFO] running `Command { std: "docker" "start" "-a" "d10b16653b193487f06f541e52061edbbddc5ce767cdd916ea8b8ba4d7a2d8d6", kill_on_drop: false }`
[INFO] [stderr] warning: /opt/rustwide/workdir/Cargo.toml: unused manifest key: dependencies.performance-considerations.default
[INFO] [stderr] warning: /opt/rustwide/workdir/Cargo.toml: unused manifest key: dependencies.singleton-wrapper.default
[INFO] [stderr]     Checking custom-lock-guard v0.1.0 (/opt/rustwide/workdir/custom-lock-guard)
[INFO] [stderr]     Checking performance-considerations v0.1.0 (/opt/rustwide/workdir/performance-considerations)
[INFO] [stderr]     Checking singleton-wrapper v0.1.0 (/opt/rustwide/workdir/singleton-wrapper)
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> custom-lock-guard/src/lib.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn lock(&self) -> CustomLockGuard<T> {
[INFO] [stdout]    |             ^^^^^     ------------------ the lifetime gets resolved as `'_`
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn lock(&self) -> CustomLockGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> custom-lock-guard/src/lib.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn lock(&self) -> RwCustomLockGuard<T> {
[INFO] [stdout]    |             ^^^^^     -------------------- the lifetime gets resolved as `'_`
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn lock(&self) -> RwCustomLockGuard<'_, T> {
[INFO] [stdout]    |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> custom-lock-guard/src/lib.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn lock(&self) -> CustomLockGuard<T> {
[INFO] [stdout]    |             ^^^^^     ------------------ the lifetime gets resolved as `'_`
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn lock(&self) -> CustomLockGuard<'_, T> {
[INFO] [stdout]    |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]   --> custom-lock-guard/src/lib.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn lock(&self) -> RwCustomLockGuard<T> {
[INFO] [stdout]    |             ^^^^^     -------------------- the lifetime gets resolved as `'_`
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lifetime flows to the output
[INFO] [stdout]    |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]    |
[INFO] [stdout] 96 |     fn lock(&self) -> RwCustomLockGuard<'_, T> {
[INFO] [stdout]    |                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking fearless-concurrency v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "d10b16653b193487f06f541e52061edbbddc5ce767cdd916ea8b8ba4d7a2d8d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d10b16653b193487f06f541e52061edbbddc5ce767cdd916ea8b8ba4d7a2d8d6", kill_on_drop: false }`
[INFO] [stdout] d10b16653b193487f06f541e52061edbbddc5ce767cdd916ea8b8ba4d7a2d8d6