[INFO] cloning repository https://github.com/ryw89/arks
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ryw89/arks" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryw89%2Farks", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryw89%2Farks'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cf312cb7d0646ab34edc8a53956c32208d2d5060
[INFO] checking ryw89/arks against try#5e7498e6740d105521420ac0ab146e2c7a21596d for pr-138363
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryw89%2Farks" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ryw89/arks on toolchain 5e7498e6740d105521420ac0ab146e2c7a21596d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5e7498e6740d105521420ac0ab146e2c7a21596d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ryw89/arks
[INFO] finished tweaking git repo https://github.com/ryw89/arks
[INFO] tweaked toml for git repo https://github.com/ryw89/arks written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ryw89/arks 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" "+5e7498e6740d105521420ac0ab146e2c7a21596d" "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 futures-sink v0.3.18
[INFO] [stderr]   Downloaded pkg-config v0.3.22
[INFO] [stderr]   Downloaded futures-task v0.3.18
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[INFO] [stderr]   Downloaded futures-macro v0.3.18
[INFO] [stderr]   Downloaded futures-io v0.3.18
[INFO] [stderr]   Downloaded futures-executor v0.3.18
[INFO] [stderr]   Downloaded cached v0.26.2
[INFO] [stderr]   Downloaded darling_macro v0.13.0
[INFO] [stderr]   Downloaded darling_core v0.13.0
[INFO] [stderr]   Downloaded futures-channel v0.3.18
[INFO] [stderr]   Downloaded darling v0.13.0
[INFO] [stderr]   Downloaded cached_proc_macro v0.7.1
[INFO] [stderr]   Downloaded futures-core v0.3.18
[INFO] [stderr]   Downloaded tar v0.4.37
[INFO] [stderr]   Downloaded futures-util v0.3.18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+5e7498e6740d105521420ac0ab146e2c7a21596d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ea14122041746af9a2eaf60d4b3fdd94d3cc5926affbe51530827a58411c8cb
[INFO] running `Command { std: "docker" "start" "-a" "6ea14122041746af9a2eaf60d4b3fdd94d3cc5926affbe51530827a58411c8cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ea14122041746af9a2eaf60d4b3fdd94d3cc5926affbe51530827a58411c8cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ea14122041746af9a2eaf60d4b3fdd94d3cc5926affbe51530827a58411c8cb", kill_on_drop: false }`
[INFO] [stdout] 6ea14122041746af9a2eaf60d4b3fdd94d3cc5926affbe51530827a58411c8cb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+5e7498e6740d105521420ac0ab146e2c7a21596d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 23f685511dfa90dda85f79f6b121792d2c9234d4212d7a218c28d9b80d32a658
[INFO] running `Command { std: "docker" "start" "-a" "23f685511dfa90dda85f79f6b121792d2c9234d4212d7a218c28d9b80d32a658", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling syn v1.0.81
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling futures-core v0.3.18
[INFO] [stderr]    Compiling futures-channel v0.3.18
[INFO] [stderr]    Compiling futures-task v0.3.18
[INFO] [stderr]     Checking futures-sink v0.3.18
[INFO] [stderr]    Compiling ident_case v1.0.1
[INFO] [stderr]    Compiling futures-util v0.3.18
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling strsim v0.10.0
[INFO] [stderr]    Compiling pkg-config v0.3.22
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking futures-io v0.3.18
[INFO] [stderr]     Checking unicode-width v0.1.9
[INFO] [stderr]     Checking ppv-lite86 v0.2.15
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]     Checking event-listener v2.5.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling cached_proc_macro_types v0.1.0
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]     Checking async-mutex v1.4.0
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking async-rwlock v1.3.0
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking xattr v0.2.2
[INFO] [stderr]     Checking filetime v0.2.15
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking colored v2.0.0
[INFO] [stderr]     Checking tar v0.4.37
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking bzip2 v0.4.3
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]    Compiling darling_core v0.13.0
[INFO] [stderr]    Compiling futures-macro v0.3.18
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling darling_macro v0.13.0
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking zip v0.5.13
[INFO] [stderr]     Checking structopt v0.3.25
[INFO] [stderr]    Compiling darling v0.13.0
[INFO] [stderr]    Compiling cached_proc_macro v0.7.1
[INFO] [stderr]     Checking futures-executor v0.3.18
[INFO] [stderr]     Checking futures v0.3.18
[INFO] [stderr]     Checking cached v0.26.2
[INFO] [stderr]     Checking arks v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0635]: unknown feature `mutex_unlock`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(mutex_unlock)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `mutex_unlock`
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(mutex_unlock)]
[INFO] [stdout]   |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `unlock` found for struct `std::sync::Mutex` in the current scope
[INFO] [stdout]   --> src/search.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Mutex::unlock(guard);
[INFO] [stdout]    |            ^^^^^^ function or associated item not found in `Mutex<_>`
[INFO] [stdout]    |
[INFO] [stdout] note: if you're trying to build a new `std::sync::Mutex<_>`, consider using `std::sync::Mutex::<T>::new` which returns `std::sync::Mutex<_>`
[INFO] [stdout]   --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:298:5
[INFO] [stdout] help: there is a method `lock` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:435:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `unlock` found for struct `std::sync::Mutex` in the current scope
[INFO] [stdout]   --> src/search.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 |     Mutex::unlock(guard);
[INFO] [stdout]    |            ^^^^^^ function or associated item not found in `Mutex<_>`
[INFO] [stdout]    |
[INFO] [stdout] note: if you're trying to build a new `std::sync::Mutex<_>`, consider using `std::sync::Mutex::<T>::new` which returns `std::sync::Mutex<_>`
[INFO] [stdout]   --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:298:5
[INFO] [stdout] help: there is a method `lock` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:435:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `unlock` found for struct `std::sync::Mutex` in the current scope
[INFO] [stdout]    --> src/main.rs:102:12
[INFO] [stdout]     |
[INFO] [stdout] 102 |     Mutex::unlock(guard);
[INFO] [stdout]     |            ^^^^^^ function or associated item not found in `Mutex<_>`
[INFO] [stdout]     |
[INFO] [stdout] note: if you're trying to build a new `std::sync::Mutex<_>`, consider using `std::sync::Mutex::<T>::new` which returns `std::sync::Mutex<_>`
[INFO] [stdout]    --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:298:5
[INFO] [stdout] help: there is a method `lock` with a similar name, but with different arguments
[INFO] [stdout]    --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:435:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no function or associated item named `unlock` found for struct `std::sync::Mutex` in the current scope
[INFO] [stdout]    --> src/main.rs:102:12
[INFO] [stdout]     |
[INFO] [stdout] 102 |     Mutex::unlock(guard);
[INFO] [stdout]     |            ^^^^^^ function or associated item not found in `Mutex<_>`
[INFO] [stdout]     |
[INFO] [stdout] note: if you're trying to build a new `std::sync::Mutex<_>`, consider using `std::sync::Mutex::<T>::new` which returns `std::sync::Mutex<_>`
[INFO] [stdout]    --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:298:5
[INFO] [stdout] help: there is a method `lock` with a similar name, but with different arguments
[INFO] [stdout]    --> /rustc/5e7498e6740d105521420ac0ab146e2c7a21596d/library/std/src/sync/poison/mutex.rs:435:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `arks` (bin "arks") due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `arks` (bin "arks" test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "23f685511dfa90dda85f79f6b121792d2c9234d4212d7a218c28d9b80d32a658", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23f685511dfa90dda85f79f6b121792d2c9234d4212d7a218c28d9b80d32a658", kill_on_drop: false }`
[INFO] [stdout] 23f685511dfa90dda85f79f6b121792d2c9234d4212d7a218c28d9b80d32a658