[INFO] fetching crate rsfs 0.4.1...
[INFO] checking rsfs-0.4.1 against master#fc81ad22c453776de16acf9938976930cf8c9401 for pr-77325
[INFO] extracting crate rsfs 0.4.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rsfs 0.4.1 on toolchain fc81ad22c453776de16acf9938976930cf8c9401
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rsfs 0.4.1
[INFO] finished tweaking crates.io crate rsfs 0.4.1
[INFO] tweaked toml for crates.io crate rsfs 0.4.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19783251a3c246bd239397f26ccd0a9250b07eecdb200565a9aa35b16de0b072
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "19783251a3c246bd239397f26ccd0a9250b07eecdb200565a9aa35b16de0b072", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19783251a3c246bd239397f26ccd0a9250b07eecdb200565a9aa35b16de0b072", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19783251a3c246bd239397f26ccd0a9250b07eecdb200565a9aa35b16de0b072", kill_on_drop: false }`
[INFO] [stdout] 19783251a3c246bd239397f26ccd0a9250b07eecdb200565a9aa35b16de0b072
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+fc81ad22c453776de16acf9938976930cf8c9401" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f7ff3746e3c2cddb25872ce09658cce35e5a487f18e5b8aca3ed6f476e5b885d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f7ff3746e3c2cddb25872ce09658cce35e5a487f18e5b8aca3ed6f476e5b885d", kill_on_drop: false }`
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking parking_lot_core v0.2.14
[INFO] [stderr]     Checking parking_lot v0.4.8
[INFO] [stderr]     Checking rsfs v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mem/unix.rs:197:13
[INFO] [stdout]     |
[INFO] [stdout] 197 |         let mut dst = &mut self.data;
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mem/unix.rs:197:13
[INFO] [stdout]     |
[INFO] [stdout] 197 |         let mut dst = &mut self.data;
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mem/unix.rs:197:13
[INFO] [stdout]     |
[INFO] [stdout] 197 |         let mut dst = &mut self.data;
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/mem/unix.rs:197:13
[INFO] [stdout]     |
[INFO] [stdout] 197 |         let mut dst = &mut self.data;
[INFO] [stdout]     |             ----^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/mem/unix.rs:1933:14
[INFO] [stdout]      |
[INFO] [stdout] 1933 |         let (mut fs, may_base) = self.traverse(normalize(&path), level)?;
[INFO] [stdout]      |              ----^^
[INFO] [stdout]      |              |
[INFO] [stdout]      |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/mem/unix.rs:1958:21
[INFO] [stdout]      |
[INFO] [stdout] 1958 |                 let mut child = *child; // copy out of the borrow
[INFO] [stdout]      |                     ----^^^^^
[INFO] [stdout]      |                     |
[INFO] [stdout]      |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/mem/unix.rs:1933:14
[INFO] [stdout]      |
[INFO] [stdout] 1933 |         let (mut fs, may_base) = self.traverse(normalize(&path), level)?;
[INFO] [stdout]      |              ----^^
[INFO] [stdout]      |              |
[INFO] [stdout]      |              help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]     --> src/mem/unix.rs:1958:21
[INFO] [stdout]      |
[INFO] [stdout] 1958 |                 let mut child = *child; // copy out of the borrow
[INFO] [stdout]      |                     ----^^^^^
[INFO] [stdout]      |                     |
[INFO] [stdout]      |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.81s
[INFO] running `Command { std: "docker" "inspect" "f7ff3746e3c2cddb25872ce09658cce35e5a487f18e5b8aca3ed6f476e5b885d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7ff3746e3c2cddb25872ce09658cce35e5a487f18e5b8aca3ed6f476e5b885d", kill_on_drop: false }`
[INFO] [stdout] f7ff3746e3c2cddb25872ce09658cce35e5a487f18e5b8aca3ed6f476e5b885d