[INFO] cloning repository https://github.com/a-rust-coder/os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/a-rust-coder/os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fa-rust-coder%2Fos", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fa-rust-coder%2Fos'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 17d77d11b8d87d387f8863fdc34c536ff8205942
[INFO] checking a-rust-coder/os against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fa-rust-coder%2Fos" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/a-rust-coder/os
[INFO] finished tweaking git repo https://github.com/a-rust-coder/os
[INFO] tweaked toml for git repo https://github.com/a-rust-coder/os written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/a-rust-coder/os on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/a-rust-coder/os 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bf342ca8de4d8f499679c28174ae6b75fce95f3167652c215c1a9179906b255
[INFO] running `Command { std: "docker" "start" "-a" "3bf342ca8de4d8f499679c28174ae6b75fce95f3167652c215c1a9179906b255", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bf342ca8de4d8f499679c28174ae6b75fce95f3167652c215c1a9179906b255", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bf342ca8de4d8f499679c28174ae6b75fce95f3167652c215c1a9179906b255", kill_on_drop: false }`
[INFO] [stdout] 3bf342ca8de4d8f499679c28174ae6b75fce95f3167652c215c1a9179906b255
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b7dfc18ecd20d93065621fc256fc176e405a856672474d18db533be33312411f
[INFO] running `Command { std: "docker" "start" "-a" "b7dfc18ecd20d93065621fc256fc176e405a856672474d18db533be33312411f", kill_on_drop: false }`
[INFO] [stderr]     Checking time-units v0.1.0 (/opt/rustwide/workdir/libs/time-units)
[INFO] [stderr]     Checking mutex v0.1.0 (/opt/rustwide/workdir/libs/mutex)
[INFO] [stderr]     Checking partfs v0.1.0 (/opt/rustwide/workdir/libs/partfs)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> libs/partfs/src/filesystems/fat/mod.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 |         let mut dir = root_dir;
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dir_entry_raw`
[INFO] [stdout]    --> libs/partfs/src/filesystems/fat/mod.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |             let dir_entry_raw = DirEntryRaw::from(entry);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_dir_entry_raw`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `MemDisk` is never constructed
[INFO] [stdout]  --> libs/partfs/src/memdisk.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct MemDisk {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `partfs` (lib) due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> libs/partfs/src/filesystems/fat/mod.rs:88:13
[INFO] [stdout]    |
[INFO] [stdout] 88 |         let mut dir = root_dir;
[INFO] [stdout]    |             ----^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `dir_entry_raw`
[INFO] [stdout]    --> libs/partfs/src/filesystems/fat/mod.rs:101:17
[INFO] [stdout]     |
[INFO] [stdout] 101 |             let dir_entry_raw = DirEntryRaw::from(entry);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_dir_entry_raw`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `MemDisk` is never constructed
[INFO] [stdout]  --> libs/partfs/src/memdisk.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct MemDisk {
[INFO] [stdout]   |            ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `partfs` (lib test) due to 1 previous error; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b7dfc18ecd20d93065621fc256fc176e405a856672474d18db533be33312411f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7dfc18ecd20d93065621fc256fc176e405a856672474d18db533be33312411f", kill_on_drop: false }`
[INFO] [stdout] b7dfc18ecd20d93065621fc256fc176e405a856672474d18db533be33312411f
