[INFO] fetching crate razor-chase 0.1.0...
[INFO] testing razor-chase-0.1.0 against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] extracting crate razor-chase 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate razor-chase 0.1.0
[INFO] finished tweaking crates.io crate razor-chase 0.1.0
[INFO] tweaked toml for crates.io crate razor-chase 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate razor-chase 0.1.0 on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "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" "+b83b707f97d809763b7861afa7638871f3339a33" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 97 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.1.2 (available: v0.7.0)
[INFO] [stderr]       Adding itertools v0.7.11 (available: v0.14.0)
[INFO] [stderr]       Adding rand v0.6.5 (available: v0.9.2)
[INFO] [stderr]       Adding wasi v0.10.0+wasi-snapshot-preview1 (available: v0.10.2+wasi-snapshot-preview1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] db6501793dc4e1a0cc39b61e229aceac8409f21768c37b3b5a7990bf1e26cb42
[INFO] running `Command { std: "docker" "start" "-a" "db6501793dc4e1a0cc39b61e229aceac8409f21768c37b3b5a7990bf1e26cb42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "db6501793dc4e1a0cc39b61e229aceac8409f21768c37b3b5a7990bf1e26cb42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db6501793dc4e1a0cc39b61e229aceac8409f21768c37b3b5a7990bf1e26cb42", kill_on_drop: false }`
[INFO] [stdout] db6501793dc4e1a0cc39b61e229aceac8409f21768c37b3b5a7990bf1e26cb42
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eae225c86d86fb1221c902e73445ffe5fe5dd85861956ef5fc545bc459c60114
[INFO] running `Command { std: "docker" "start" "-a" "eae225c86d86fb1221c902e73445ffe5fe5dd85861956ef5fc545bc459c60114", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling memchr v2.7.5
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling cast v0.1.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling time v0.1.45
[INFO] [stderr]    Compiling num_cpus v0.2.13
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling bytecount v0.3.2
[INFO] [stderr]    Compiling term v0.4.6
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling thread-scoped v1.0.2
[INFO] [stderr]    Compiling isatty v0.1.9
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling criterion-plot v0.1.3
[INFO] [stderr]    Compiling itertools v0.7.11
[INFO] [stderr]    Compiling itertools v0.4.19
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling criterion-stats v0.1.3
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling simplelog v0.4.4
[INFO] [stderr]    Compiling object v0.36.7
[INFO] [stderr]    Compiling serde_json v1.0.143
[INFO] [stderr]    Compiling nom_locate v0.3.1
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling backtrace v0.3.75
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling tracing-attributes v0.1.30
[INFO] [stderr]    Compiling razor-fol v0.1.0
[INFO] [stderr]    Compiling tracing v0.1.41
[INFO] [stderr]    Compiling criterion v0.1.2
[INFO] [stderr]    Compiling razor-chase v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/trace/subscriber.rs:42:25
[INFO] [stdout]    |
[INFO] [stdout] 42 |                     let _ = self.chase_step_record
[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] 42 |                     let _unused = self.chase_step_record
[INFO] [stdout]    |                          ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 42 ~                     drop(self.chase_step_record
[INFO] [stdout] 43 |                         .lock()
[INFO] [stdout] ...
[INFO] [stdout] 46 |                             rec
[INFO] [stdout] 47 ~                         }));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/trace/subscriber.rs:52:25
[INFO] [stdout]    |
[INFO] [stdout] 52 |                     let _ = self.chase_step_record
[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] 52 |                     let _unused = self.chase_step_record
[INFO] [stdout]    |                          ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 52 ~                     drop(self.chase_step_record
[INFO] [stdout] 53 |                         .lock()
[INFO] [stdout] ...
[INFO] [stdout] 56 |                             rec
[INFO] [stdout] 57 ~                         }));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `razor-chase` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "eae225c86d86fb1221c902e73445ffe5fe5dd85861956ef5fc545bc459c60114", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eae225c86d86fb1221c902e73445ffe5fe5dd85861956ef5fc545bc459c60114", kill_on_drop: false }`
[INFO] [stdout] eae225c86d86fb1221c902e73445ffe5fe5dd85861956ef5fc545bc459c60114