[INFO] cloning repository https://github.com/Dirk007/rust_lock_benchy
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Dirk007/rust_lock_benchy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDirk007%2Frust_lock_benchy", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDirk007%2Frust_lock_benchy'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4331791d778d934db62334ccf7cc618ee6e5468c
[INFO] checking Dirk007/rust_lock_benchy against master#e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682 for beta-170-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDirk007%2Frust_lock_benchy" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Dirk007/rust_lock_benchy on toolchain e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Dirk007/rust_lock_benchy
[INFO] finished tweaking git repo https://github.com/Dirk007/rust_lock_benchy
[INFO] tweaked toml for git repo https://github.com/Dirk007/rust_lock_benchy written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Dirk007/rust_lock_benchy 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" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a066505601943232ca24550ca8d953057c9d81a736fb84d9e59faf2dfa19f20
[INFO] running `Command { std: "docker" "start" "-a" "7a066505601943232ca24550ca8d953057c9d81a736fb84d9e59faf2dfa19f20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a066505601943232ca24550ca8d953057c9d81a736fb84d9e59faf2dfa19f20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a066505601943232ca24550ca8d953057c9d81a736fb84d9e59faf2dfa19f20", kill_on_drop: false }`
[INFO] [stdout] 7a066505601943232ca24550ca8d953057c9d81a736fb84d9e59faf2dfa19f20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 62ed01bf0b4b23adb2a5b756d593f9802cb82b3647597a07896dd8e50cbe4bb6
[INFO] running `Command { std: "docker" "start" "-a" "62ed01bf0b4b23adb2a5b756d593f9802cb82b3647597a07896dd8e50cbe4bb6", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]    Compiling futures-macro v0.3.17
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]    Compiling futures-channel v0.3.17
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]     Checking futures-sink v0.3.17
[INFO] [stderr]    Compiling parking_lot_core v0.8.5
[INFO] [stderr]     Checking instant v0.1.12
[INFO] [stderr]     Checking smallvec v1.7.0
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking futures-io v0.3.17
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]    Compiling tokio v1.12.0
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking mio v0.7.14
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]    Compiling tokio-macros v1.5.0
[INFO] [stderr]     Checking futures-executor v0.3.17
[INFO] [stderr]     Checking futures v0.3.17
[INFO] [stderr]     Checking test_mux v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/main.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let _ = lock_read!(thing);
[INFO] [stdout]    |             ^   ----------------- in this macro invocation
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         $a.read().unwrap()
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^ this binding will immediately drop the value assigned to it
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout]    = note: this error originates in the macro `lock_read` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let _unused = lock_read!(thing);
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]   --> src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         drop()
[INFO] [stdout]    |         ~~~~~             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/main.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let _ = lock_read!(thing);
[INFO] [stdout]    |             ^   ----------------- in this macro invocation
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         $a.read().unwrap()
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^ this binding will immediately drop the value assigned to it
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout]    = note: this error originates in the macro `lock_read` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 46 |         let _unused = lock_read!(thing);
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]   --> src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         drop()
[INFO] [stdout]    |         ~~~~~             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/main.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let _ = lock_read!(thing);
[INFO] [stdout]    |             ^   ----------------- in this macro invocation
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         $a.read().unwrap()
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^ this binding will immediately drop the value assigned to it
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `lock_read` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let _unused = lock_read!(thing);
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]   --> src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         drop()
[INFO] [stdout]    |         ~~~~~             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/main.rs:52:13
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let _ = lock_read!(thing);
[INFO] [stdout]    |             ^   ----------------- in this macro invocation
[INFO] [stdout]    |             |
[INFO] [stdout]    |             this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         $a.read().unwrap()
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^ this binding will immediately drop the value assigned to it
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the macro `lock_read` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 52 |         let _unused = lock_read!(thing);
[INFO] [stdout]    |             ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]   --> src/macros.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |         drop()
[INFO] [stdout]    |         ~~~~~             +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `test_mux` (bin "test_mux") due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `test_mux` (bin "test_mux" test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "62ed01bf0b4b23adb2a5b756d593f9802cb82b3647597a07896dd8e50cbe4bb6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "62ed01bf0b4b23adb2a5b756d593f9802cb82b3647597a07896dd8e50cbe4bb6", kill_on_drop: false }`
[INFO] [stdout] 62ed01bf0b4b23adb2a5b756d593f9802cb82b3647597a07896dd8e50cbe4bb6
