[INFO] fetching crate razor-chase 0.1.0...
[INFO] checking razor-chase-0.1.0 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[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 a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "rm" "-f" "04d1d089b2a92c8420a7c9c4b407fe420e4dcc3b204e6586f83e1ddd05f9f158", kill_on_drop: false }`
[INFO] [stdout] 04d1d089b2a92c8420a7c9c4b407fe420e4dcc3b204e6586f83e1ddd05f9f158
[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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 73f98735b692cf242a98f3b9e9706e4d2bf67d5b11c8df8317ae8df7ec863aa1
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[INFO] [stderr]     Checking 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)]` 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] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:939:9
[INFO] [stdout]     |
[INFO] [stdout] 939 |         Sequent::from(&"true".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 939 |         let _ = Sequent::from(&"true".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:945:9
[INFO] [stdout]     |
[INFO] [stdout] 945 |         Sequent::from(&"false".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 945 |         let _ = Sequent::from(&"false".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:951:9
[INFO] [stdout]     |
[INFO] [stdout] 951 |         Sequent::from(&"false -> true".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 951 |         let _ = Sequent::from(&"false -> true".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:957:9
[INFO] [stdout]     |
[INFO] [stdout] 957 |         Sequent::from(&"(P(x) | Q(x)) -> R(x)".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 957 |         let _ = Sequent::from(&"(P(x) | Q(x)) -> R(x)".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:963:9
[INFO] [stdout]     |
[INFO] [stdout] 963 |         Sequent::from(&"P(x) -> R(x) & (Q(z) | R(z))".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 963 |         let _ = Sequent::from(&"P(x) -> R(x) & (Q(z) | R(z))".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:969:9
[INFO] [stdout]     |
[INFO] [stdout] 969 |         Sequent::from(&"P(x) -> ?x. Q(x)".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 969 |         let _ = Sequent::from(&"P(x) -> ?x. Q(x)".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:975:9
[INFO] [stdout]     |
[INFO] [stdout] 975 |         Sequent::from(&"?x.Q(x) -> P(x)".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 975 |         let _ = Sequent::from(&"?x.Q(x) -> P(x)".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:981:9
[INFO] [stdout]     |
[INFO] [stdout] 981 |         Sequent::from(&"true -> ~false".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 981 |         let _ = Sequent::from(&"true -> ~false".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:987:9
[INFO] [stdout]     |
[INFO] [stdout] 987 |         Sequent::from(&"true -> ~true".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 987 |         let _ = Sequent::from(&"true -> ~true".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::convert::From::from` that must be used
[INFO] [stdout]    --> src/chase/impl/basic.rs:993:9
[INFO] [stdout]     |
[INFO] [stdout] 993 |         Sequent::from(&"~P(x) -> ~Q(x)".parse().unwrap());
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 993 |         let _ = Sequent::from(&"~P(x) -> ~Q(x)".parse().unwrap());
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[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)]` 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 test) due to 2 previous errors; 10 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "73f98735b692cf242a98f3b9e9706e4d2bf67d5b11c8df8317ae8df7ec863aa1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73f98735b692cf242a98f3b9e9706e4d2bf67d5b11c8df8317ae8df7ec863aa1", kill_on_drop: false }`
[INFO] [stdout] 73f98735b692cf242a98f3b9e9706e4d2bf67d5b11c8df8317ae8df7ec863aa1