[INFO] cloning repository https://github.com/matklad/properly-concurrent
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/matklad/properly-concurrent" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fproperly-concurrent", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fproperly-concurrent'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ceccf9cc6142a0b17661c3eb0d277ec8ea402b97
[INFO] checking matklad/properly-concurrent against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fproperly-concurrent" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/matklad/properly-concurrent on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/matklad/properly-concurrent
[INFO] finished tweaking git repo https://github.com/matklad/properly-concurrent
[INFO] tweaked toml for git repo https://github.com/matklad/properly-concurrent written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/matklad/properly-concurrent 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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded arbtest v0.3.1
[INFO] [stderr]   Downloaded exhaustigen v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d5e2382c2675c15246fed2406ab1397b8ffb6c0eaa98b159d3ec51406ad31ca
[INFO] running `Command { std: "docker" "start" "-a" "0d5e2382c2675c15246fed2406ab1397b8ffb6c0eaa98b159d3ec51406ad31ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d5e2382c2675c15246fed2406ab1397b8ffb6c0eaa98b159d3ec51406ad31ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d5e2382c2675c15246fed2406ab1397b8ffb6c0eaa98b159d3ec51406ad31ca", kill_on_drop: false }`
[INFO] [stdout] 0d5e2382c2675c15246fed2406ab1397b8ffb6c0eaa98b159d3ec51406ad31ca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 362ed256aac131a2eb1e737ace7b6d06a1185e8edc37691d552bf9e03220f2ae
[INFO] running `Command { std: "docker" "start" "-a" "362ed256aac131a2eb1e737ace7b6d06a1185e8edc37691d552bf9e03220f2ae", kill_on_drop: false }`
[INFO] [stderr]     Checking arbitrary v1.3.2
[INFO] [stderr]     Checking exhaustigen v0.1.0
[INFO] [stderr]     Checking arbtest v0.3.1
[INFO] [stderr]     Checking properly-concurrent v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 124 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 124 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.21s
[INFO] running `Command { std: "docker" "inspect" "362ed256aac131a2eb1e737ace7b6d06a1185e8edc37691d552bf9e03220f2ae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "362ed256aac131a2eb1e737ace7b6d06a1185e8edc37691d552bf9e03220f2ae", kill_on_drop: false }`
[INFO] [stdout] 362ed256aac131a2eb1e737ace7b6d06a1185e8edc37691d552bf9e03220f2ae
[INFO] checking matklad/properly-concurrent against try#6289438dbad80b1a0029c66dd3f6abf57c2c51be for pr-126452-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fproperly-concurrent" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/matklad/properly-concurrent on toolchain 6289438dbad80b1a0029c66dd3f6abf57c2c51be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/matklad/properly-concurrent
[INFO] finished tweaking git repo https://github.com/matklad/properly-concurrent
[INFO] tweaked toml for git repo https://github.com/matklad/properly-concurrent written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/matklad/properly-concurrent 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" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5ae1c15b1f12b1bc03cb0c668b03abdad1e21934cdafa0214949b6156dd229fb
[INFO] running `Command { std: "docker" "start" "-a" "5ae1c15b1f12b1bc03cb0c668b03abdad1e21934cdafa0214949b6156dd229fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5ae1c15b1f12b1bc03cb0c668b03abdad1e21934cdafa0214949b6156dd229fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5ae1c15b1f12b1bc03cb0c668b03abdad1e21934cdafa0214949b6156dd229fb", kill_on_drop: false }`
[INFO] [stdout] 5ae1c15b1f12b1bc03cb0c668b03abdad1e21934cdafa0214949b6156dd229fb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99bf6770711b12eb27b1d8340003d0af39e1ee631fed8229f907e1f597c21abc
[INFO] running `Command { std: "docker" "start" "-a" "99bf6770711b12eb27b1d8340003d0af39e1ee631fed8229f907e1f597c21abc", kill_on_drop: false }`
[INFO] [stderr]     Checking arbitrary v1.3.2
[INFO] [stderr]     Checking exhaustigen v0.1.0
[INFO] [stderr]     Checking arbtest v0.3.1
[INFO] [stderr]     Checking properly-concurrent v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 124 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:124:5
[INFO] [stdout]     |
[INFO] [stdout] 124 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `guard` is never read
[INFO] [stdout]    --> src/managed_thread.rs:136:5
[INFO] [stdout]     |
[INFO] [stdout] 136 |     guard = self
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.17s
[INFO] running `Command { std: "docker" "inspect" "99bf6770711b12eb27b1d8340003d0af39e1ee631fed8229f907e1f597c21abc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99bf6770711b12eb27b1d8340003d0af39e1ee631fed8229f907e1f597c21abc", kill_on_drop: false }`
[INFO] [stdout] 99bf6770711b12eb27b1d8340003d0af39e1ee631fed8229f907e1f597c21abc