[INFO] fetching crate wolfpack 0.3.0...
[INFO] checking wolfpack-0.3.0 against try#804fff1ae95da9d03bd44eee27f258020a575dab for pr-146013
[INFO] extracting crate wolfpack 0.3.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate wolfpack 0.3.0
[INFO] finished tweaking crates.io crate wolfpack 0.3.0
[INFO] tweaked toml for crates.io crate wolfpack 0.3.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate wolfpack 0.3.0 on toolchain 804fff1ae95da9d03bd44eee27f258020a575dab
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+804fff1ae95da9d03bd44eee27f258020a575dab" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate wolfpack 0.3.0 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" "+804fff1ae95da9d03bd44eee27f258020a575dab" "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-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_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" "+804fff1ae95da9d03bd44eee27f258020a575dab" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5189dffb5ef55204e9191c74f5ebc25e4900f864b14d472c98b97b769fe695d8
[INFO] running `Command { std: "docker" "start" "-a" "5189dffb5ef55204e9191c74f5ebc25e4900f864b14d472c98b97b769fe695d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5189dffb5ef55204e9191c74f5ebc25e4900f864b14d472c98b97b769fe695d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5189dffb5ef55204e9191c74f5ebc25e4900f864b14d472c98b97b769fe695d8", kill_on_drop: false }`
[INFO] [stdout] 5189dffb5ef55204e9191c74f5ebc25e4900f864b14d472c98b97b769fe695d8
[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" "+804fff1ae95da9d03bd44eee27f258020a575dab" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e3455b887ffbe3c9010631e657753ccdf4a59129f445065cad336c378eaabf94
[INFO] running `Command { std: "docker" "start" "-a" "e3455b887ffbe3c9010631e657753ccdf4a59129f445065cad336c378eaabf94", kill_on_drop: false }`
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[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]  --> src/test/concurrency.rs:6:36
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn prevent_concurrency(bucket: &str) -> MutexGuard<()> {
[INFO] [stdout]   |                                    ^^^^     ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]   |                                    |
[INFO] [stdout]   |                                    the lifetime is elided here
[INFO] [stdout]   |
[INFO] [stdout]   = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]   = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub fn prevent_concurrency(bucket: &str) -> MutexGuard<'_, ()> {
[INFO] [stdout]   |                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 03s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: num-bigint-dig v0.8.4
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 6`
[INFO] running `Command { std: "docker" "inspect" "e3455b887ffbe3c9010631e657753ccdf4a59129f445065cad336c378eaabf94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3455b887ffbe3c9010631e657753ccdf4a59129f445065cad336c378eaabf94", kill_on_drop: false }`
[INFO] [stdout] e3455b887ffbe3c9010631e657753ccdf4a59129f445065cad336c378eaabf94