[INFO] cloning repository https://github.com/tiden0614/completable-future-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tiden0614/completable-future-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiden0614%2Fcompletable-future-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiden0614%2Fcompletable-future-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1c066b3cc3aa4493ea1ff7e54880be31372631c8
[INFO] checking tiden0614/completable-future-rs against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftiden0614%2Fcompletable-future-rs" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tiden0614/completable-future-rs on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tiden0614/completable-future-rs
[INFO] finished tweaking git repo https://github.com/tiden0614/completable-future-rs
[INFO] tweaked toml for git repo https://github.com/tiden0614/completable-future-rs written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/tiden0614/completable-future-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-util v0.2.1
[INFO] [stderr]   Downloaded futures-io v0.2.1
[INFO] [stderr]   Downloaded futures-stable v0.2.1
[INFO] [stderr]   Downloaded either v1.5.0
[INFO] [stderr]   Downloaded futures-core v0.2.1
[INFO] [stderr]   Downloaded futures-async-runtime v0.2.1
[INFO] [stderr]   Downloaded futures-channel v0.2.1
[INFO] [stderr]   Downloaded futures-sink v0.2.1
[INFO] [stderr]   Downloaded futures v0.2.1
[INFO] [stderr]   Downloaded futures-executor v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3343d3dfc9b4edaba90ae83b470c9c67ae7e18f2af6c846cd6a1c4c6a295e477
[INFO] running `Command { std: "docker" "start" "-a" "3343d3dfc9b4edaba90ae83b470c9c67ae7e18f2af6c846cd6a1c4c6a295e477", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3343d3dfc9b4edaba90ae83b470c9c67ae7e18f2af6c846cd6a1c4c6a295e477", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3343d3dfc9b4edaba90ae83b470c9c67ae7e18f2af6c846cd6a1c4c6a295e477", kill_on_drop: false }`
[INFO] [stdout] 3343d3dfc9b4edaba90ae83b470c9c67ae7e18f2af6c846cd6a1c4c6a295e477
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 952b90645d032764720376d8cd7a014b2a8a6897189a598bd94f11f4b7acb970
[INFO] running `Command { std: "docker" "start" "-a" "952b90645d032764720376d8cd7a014b2a8a6897189a598bd94f11f4b7acb970", kill_on_drop: false }`
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking libc v0.2.42
[INFO] [stderr]     Checking lazy_static v1.0.1
[INFO] [stderr]     Checking futures-core v0.2.1
[INFO] [stderr]     Checking futures-channel v0.2.1
[INFO] [stderr]     Checking futures-sink v0.2.1
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking futures-io v0.2.1
[INFO] [stderr]     Checking futures-util v0.2.1
[INFO] [stderr]     Checking futures-executor v0.2.1
[INFO] [stderr]     Checking futures-stable v0.2.1
[INFO] [stderr]     Checking futures-async-runtime v0.2.1
[INFO] [stderr]     Checking futures v0.2.1
[INFO] [stderr]     Checking completable_future v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/lib.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 mem::replace(self, WakerWrapper::Registered(w));
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/lib.rs:78:17
[INFO] [stdout]    |
[INFO] [stdout] 78 |                 mem::replace(self, WakerWrapper::Registered(w));
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/tests.rs:67:7
[INFO] [stdout]    |
[INFO] [stdout] 67 |         let mut tm = mutate_counter.clone();
[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]   --> tests/tests.rs:89:7
[INFO] [stdout]    |
[INFO] [stdout] 89 |         let mut tm = mutate_counter.clone();
[INFO] [stdout]    |             ----^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.79s
[INFO] running `Command { std: "docker" "inspect" "952b90645d032764720376d8cd7a014b2a8a6897189a598bd94f11f4b7acb970", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "952b90645d032764720376d8cd7a014b2a8a6897189a598bd94f11f4b7acb970", kill_on_drop: false }`
[INFO] [stdout] 952b90645d032764720376d8cd7a014b2a8a6897189a598bd94f11f4b7acb970