[INFO] fetching crate srcu 0.1.0...
[INFO] testing srcu-0.1.0 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-8
[INFO] extracting crate srcu 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate srcu 0.1.0
[INFO] finished tweaking crates.io crate srcu 0.1.0
[INFO] tweaked toml for crates.io crate srcu 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate srcu 0.1.0 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 1 package to latest compatible version
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded barrier v0.1.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ea9ae76f4533ff85f2780b3238972578b1578b260c045ef2c3386747d1f6e4e7
[INFO] running `Command { std: "docker" "start" "-a" "ea9ae76f4533ff85f2780b3238972578b1578b260c045ef2c3386747d1f6e4e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ea9ae76f4533ff85f2780b3238972578b1578b260c045ef2c3386747d1f6e4e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea9ae76f4533ff85f2780b3238972578b1578b260c045ef2c3386747d1f6e4e7", kill_on_drop: false }`
[INFO] [stdout] ea9ae76f4533ff85f2780b3238972578b1578b260c045ef2c3386747d1f6e4e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f51bf4fa3edd0e04991467cd5f96231739c9b34aff7b4daf8b66e808e0d6ba27
[INFO] running `Command { std: "docker" "start" "-a" "f51bf4fa3edd0e04991467cd5f96231739c9b34aff7b4daf8b66e808e0d6ba27", kill_on_drop: false }`
[INFO] [stderr]    Compiling barrier v0.1.0
[INFO] [stderr]    Compiling srcu v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `hash_extract_if` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(hash_extract_if)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `lazy_cell` has been stable since 1.80.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(lazy_cell)]
[INFO] [stdout]   |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `srcu` (lib) due to 4 previous errors; 2 warnings emitted
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:170:9
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let _ = event.1.wait(event.0.lock().unwrap());
[INFO] [stdout]     |         ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(let_underscore_lock)]` (part of `#[deny(let_underscore)]`) on by default
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 170 |     let _unused = event.1.wait(event.0.lock().unwrap());
[INFO] [stdout]     |          ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 170 -     let _ = event.1.wait(event.0.lock().unwrap());
[INFO] [stdout] 170 +     drop(event.1.wait(event.0.lock().unwrap()));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:232:13
[INFO] [stdout]     |
[INFO] [stdout] 232 |         let _ = RCU_GP_EVENT.wait(RCU_GP_COND.lock().unwrap());
[INFO] [stdout]     |             ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]     |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 232 |         let _unused = RCU_GP_EVENT.wait(RCU_GP_COND.lock().unwrap());
[INFO] [stdout]     |              ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 232 -         let _ = RCU_GP_EVENT.wait(RCU_GP_COND.lock().unwrap());
[INFO] [stdout] 232 +         drop(RCU_GP_EVENT.wait(RCU_GP_COND.lock().unwrap()));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:253:37
[INFO] [stdout]     |
[INFO] [stdout] 253 | ...                   let _ = RCU_CALL_READY_EVENT
[INFO] [stdout]     |                           ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]     |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 253 |                                 let _unused = RCU_CALL_READY_EVENT
[INFO] [stdout]     |                                      ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 253 ~                                 drop(RCU_CALL_READY_EVENT
[INFO] [stdout] 254 ~                                     .wait(RCU_CALL_READY_EVENT_COND.lock().unwrap()));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:276:37
[INFO] [stdout]     |
[INFO] [stdout] 276 | ...                   let _ = RCU_CALL_READY_EVENT
[INFO] [stdout]     |                           ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]     |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 276 |                                 let _unused = RCU_CALL_READY_EVENT
[INFO] [stdout]     |                                      ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 276 ~                                 drop(RCU_CALL_READY_EVENT
[INFO] [stdout] 277 ~                                     .wait(RCU_CALL_READY_EVENT_COND.lock().unwrap()));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f51bf4fa3edd0e04991467cd5f96231739c9b34aff7b4daf8b66e808e0d6ba27", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f51bf4fa3edd0e04991467cd5f96231739c9b34aff7b4daf8b66e808e0d6ba27", kill_on_drop: false }`
[INFO] [stdout] f51bf4fa3edd0e04991467cd5f96231739c9b34aff7b4daf8b66e808e0d6ba27
