[INFO] fetching crate railsgun 1.0.3...
[INFO] checking railsgun-1.0.3 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate railsgun 1.0.3 into /workspace/builds/worker-119/source
[INFO] validating manifest of crates.io crate railsgun 1.0.3 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate railsgun 1.0.3
[INFO] finished tweaking crates.io crate railsgun 1.0.3
[INFO] tweaked toml for crates.io crate railsgun 1.0.3 written to /workspace/builds/worker-119/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1620c7823177d39600e7528d05f6b095668fef295d321ac04e1880cc5b7475cd
[INFO] running `Command { std: "docker" "start" "-a" "1620c7823177d39600e7528d05f6b095668fef295d321ac04e1880cc5b7475cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1620c7823177d39600e7528d05f6b095668fef295d321ac04e1880cc5b7475cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1620c7823177d39600e7528d05f6b095668fef295d321ac04e1880cc5b7475cd", kill_on_drop: false }`
[INFO] [stdout] 1620c7823177d39600e7528d05f6b095668fef295d321ac04e1880cc5b7475cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-119/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f402fd43998aade650e7c29c0305c7710b67de37927fb281ced06531f940285f
[INFO] running `Command { std: "docker" "start" "-a" "f402fd43998aade650e7c29c0305c7710b67de37927fb281ced06531f940285f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling tokio v1.14.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]    Compiling tokio-macros v1.6.0
[INFO] [stderr]     Checking railsgun v1.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]    --> src/lib.rs:165:1
[INFO] [stdout]     |
[INFO] [stdout] 165 | #[macro_use]
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:858:31
[INFO] [stdout]     |
[INFO] [stdout] 858 |             Result::Err(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:894:30
[INFO] [stdout]     |
[INFO] [stdout] 894 |             Result::Ok(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                              ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]    --> src/lib.rs:165:1
[INFO] [stdout]     |
[INFO] [stdout] 165 | #[macro_use]
[INFO] [stdout]     | ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout]     --> src/async_result.rs:1661:9
[INFO] [stdout]      |
[INFO] [stdout] 1661 |     use std::num::ParseIntError;
[INFO] [stdout]      |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]     --> src/async_result.rs:1784:35
[INFO] [stdout]      |
[INFO] [stdout] 1784 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);
[INFO] [stdout]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]     --> src/async_result.rs:1787:35
[INFO] [stdout]      |
[INFO] [stdout] 1787 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
[INFO] [stdout]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]     --> src/block_in_place_result.rs:1141:35
[INFO] [stdout]      |
[INFO] [stdout] 1141 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 3);
[INFO] [stdout]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]     --> src/block_in_place_result.rs:1144:35
[INFO] [stdout]      |
[INFO] [stdout] 1144 |         assert_eq!(x.map_or_else(|e| k * 2, |v| v.len()), 42);
[INFO] [stdout]      |                                   ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:858:31
[INFO] [stdout]     |
[INFO] [stdout] 858 |             Result::Err(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                               ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/async_result.rs:894:30
[INFO] [stdout]     |
[INFO] [stdout] 894 |             Result::Ok(_) => unsafe { hint::unreachable_unchecked() },
[INFO] [stdout]     |                              ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.85s
[INFO] running `Command { std: "docker" "inspect" "f402fd43998aade650e7c29c0305c7710b67de37927fb281ced06531f940285f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f402fd43998aade650e7c29c0305c7710b67de37927fb281ced06531f940285f", kill_on_drop: false }`
[INFO] [stdout] f402fd43998aade650e7c29c0305c7710b67de37927fb281ced06531f940285f