[INFO] fetching crate razor-chase 0.1.0...
[INFO] checking razor-chase-0.1.0 against master#39cb3386ddc6c71657418be28dbb3987eea4aa4b for pr-133536
[INFO] extracting crate razor-chase 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate razor-chase 0.1.0 on toolchain 39cb3386ddc6c71657418be28dbb3987eea4aa4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 97 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.1.2 (available: v0.5.1)
[INFO] [stderr]       Adding itertools v0.7.11 (available: v0.13.0)
[INFO] [stderr]       Adding rand v0.6.5 (available: v0.8.5)
[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" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded razor-fol v0.1.0
[INFO] [stderr]   Downloaded thread-scoped v1.0.2
[INFO] [stderr]   Downloaded isatty v0.1.9
[INFO] [stderr]   Downloaded criterion-stats v0.1.3
[INFO] [stderr]   Downloaded simplelog v0.4.4
[INFO] [stderr]   Downloaded cast v0.1.0
[INFO] [stderr]   Downloaded criterion v0.1.2
[INFO] [stderr]   Downloaded criterion-plot v0.1.3
[INFO] [stderr]   Downloaded nom_locate v0.3.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2de32dae8080ad679c19819f50b8fb0966ad5aace7f9dc86bdbcfede425c91b5
[INFO] running `Command { std: "docker" "start" "-a" "2de32dae8080ad679c19819f50b8fb0966ad5aace7f9dc86bdbcfede425c91b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2de32dae8080ad679c19819f50b8fb0966ad5aace7f9dc86bdbcfede425c91b5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2de32dae8080ad679c19819f50b8fb0966ad5aace7f9dc86bdbcfede425c91b5", kill_on_drop: false }`
[INFO] [stdout] 2de32dae8080ad679c19819f50b8fb0966ad5aace7f9dc86bdbcfede425c91b5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a76ec84eca007177355a65e7fffde6e1d69ec462078b953b7a3ad267c38851d
[INFO] running `Command { std: "docker" "start" "-a" "2a76ec84eca007177355a65e7fffde6e1d69ec462078b953b7a3ad267c38851d", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking gimli v0.31.1
[INFO] [stderr]    Compiling unicode-xid v0.2.6
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking miniz_oxide v0.8.0
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]     Checking cast v0.1.0
[INFO] [stderr]     Checking num_cpus v0.2.13
[INFO] [stderr]     Checking time v0.1.45
[INFO] [stderr]    Compiling syn v2.0.90
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking itertools v0.5.10
[INFO] [stderr]     Checking bytecount v0.3.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking thread-scoped v1.0.2
[INFO] [stderr]     Checking term v0.4.6
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking criterion-stats v0.1.3
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking tracing-core v0.1.33
[INFO] [stderr]     Checking itertools v0.7.11
[INFO] [stderr]     Checking itertools v0.4.19
[INFO] [stderr]     Checking simplelog v0.4.4
[INFO] [stderr]     Checking object v0.36.5
[INFO] [stderr]     Checking serde_json v1.0.133
[INFO] [stderr]     Checking criterion-plot v0.1.3
[INFO] [stderr]     Checking nom_locate v0.3.1
[INFO] [stderr]     Checking addr2line v0.24.2
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking backtrace v0.3.74
[INFO] [stderr]    Compiling serde_derive v1.0.215
[INFO] [stderr]    Compiling tracing-attributes v0.1.28
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking razor-fol v0.1.0
[INFO] [stderr]     Checking tracing v0.1.41
[INFO] [stderr]     Checking criterion v0.1.2
[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" "2a76ec84eca007177355a65e7fffde6e1d69ec462078b953b7a3ad267c38851d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a76ec84eca007177355a65e7fffde6e1d69ec462078b953b7a3ad267c38851d", kill_on_drop: false }`
[INFO] [stdout] 2a76ec84eca007177355a65e7fffde6e1d69ec462078b953b7a3ad267c38851d
