[INFO] crate seed 0.4.0 is already in cache
[INFO] checking seed-0.4.0 against master#f834695781d00daa61d04e11720403ff32cb0e78 for pr-63831
[INFO] extracting crate seed 0.4.0 into work/builds/worker-7/source
[INFO] validating manifest of crates.io crate seed 0.4.0 on toolchain f834695781d00daa61d04e11720403ff32cb0e78
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+f834695781d00daa61d04e11720403ff32cb0e78" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate seed 0.4.0
[INFO] finished tweaking crates.io crate seed 0.4.0
[INFO] tweaked toml for crates.io crate seed 0.4.0 written to work/builds/worker-7/source/Cargo.toml
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+f834695781d00daa61d04e11720403ff32cb0e78" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+f834695781d00daa61d04e11720403ff32cb0e78" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-7/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+f834695781d00daa61d04e11720403ff32cb0e78" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] bb6e8d5be4b092e8432b4091879956e837871d20cb22424ebfffee754e877da2
[INFO] running `"docker" "start" "-a" "bb6e8d5be4b092e8432b4091879956e837871d20cb22424ebfffee754e877da2"`
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
[INFO] [stderr]    Compiling unicode-segmentation v1.3.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.51
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling bitflags v1.2.0
[INFO] [stderr]    Compiling pulldown-cmark v0.5.3
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking enclose v1.1.8
[INFO] [stderr]     Checking indexmap v1.2.0
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling unicase v2.5.1
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling backtrace v0.3.38
[INFO] [stderr]     Checking js-sys v0.3.28
[INFO] [stderr]     Checking console_error_panic_hook v0.1.6
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]     Checking wasm-bindgen-futures v0.3.27
[INFO] [stderr]     Checking wasm-bindgen-test v0.2.50
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.51
[INFO] [stderr]    Compiling web-sys v0.3.28
[INFO] [stderr]     Checking seed v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/fetch.rs:474:21
[INFO] [stderr]     |
[INFO] [stderr] 474 |                 let mut output_future: Box<
[INFO] [stderr]     |                     ----^^^^^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/fetch.rs:474:21
[INFO] [stderr]     |
[INFO] [stderr] 474 |                 let mut output_future: Box<
[INFO] [stderr]     |                     ----^^^^^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 13s
[INFO] running `"docker" "inspect" "bb6e8d5be4b092e8432b4091879956e837871d20cb22424ebfffee754e877da2"`
[INFO] running `"docker" "rm" "-f" "bb6e8d5be4b092e8432b4091879956e837871d20cb22424ebfffee754e877da2"`
[INFO] [stdout] bb6e8d5be4b092e8432b4091879956e837871d20cb22424ebfffee754e877da2