[INFO] cloning repository https://github.com/menchauser/rust-bitcask
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/menchauser/rust-bitcask" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmenchauser%2Frust-bitcask", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmenchauser%2Frust-bitcask'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 616b6ce485550297c29e4a83a6771f816d5cc845
[INFO] checking menchauser/rust-bitcask against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmenchauser%2Frust-bitcask" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/menchauser/rust-bitcask
[INFO] finished tweaking git repo https://github.com/menchauser/rust-bitcask
[INFO] tweaked toml for git repo https://github.com/menchauser/rust-bitcask written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/menchauser/rust-bitcask on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/menchauser/rust-bitcask 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1e0f01aaee7d02fb2dd2e907f488ea9ca2ec8670ff92946c7b4bf22f56b043fa
[INFO] running `Command { std: "docker" "start" "-a" "1e0f01aaee7d02fb2dd2e907f488ea9ca2ec8670ff92946c7b4bf22f56b043fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e0f01aaee7d02fb2dd2e907f488ea9ca2ec8670ff92946c7b4bf22f56b043fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e0f01aaee7d02fb2dd2e907f488ea9ca2ec8670ff92946c7b4bf22f56b043fa", kill_on_drop: false }`
[INFO] [stdout] 1e0f01aaee7d02fb2dd2e907f488ea9ca2ec8670ff92946c7b4bf22f56b043fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 90d076ca8dc24c76c46ad5ba471e5edf8a2be762935633d30930f1e1970c5f3d
[INFO] running `Command { std: "docker" "start" "-a" "90d076ca8dc24c76c46ad5ba471e5edf8a2be762935633d30930f1e1970c5f3d", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.26
[INFO] [stderr]    Compiling libc v0.2.174
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling crc32c v0.6.8
[INFO] [stderr]     Checking getrandom v0.3.3
[INFO] [stderr]     Checking rand_core v0.9.3
[INFO] [stderr]     Checking rust-bitcasket v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking rand_chacha v0.9.0
[INFO] [stdout] warning: field `db_dir` is never read
[INFO] [stdout]   --> src/datastore.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Datastore<'a> {
[INFO] [stdout]    |            --------- field in this struct
[INFO] [stdout] 11 |     /// Path to the root directory with datafiles
[INFO] [stdout] 12 |     db_dir: &'a Path,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Keys` is never constructed
[INFO] [stdout]   --> src/datastore.rs:26:12
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub struct Keys<'a> {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `cause` is never read
[INFO] [stdout]   --> src/datastore.rs:67:15
[INFO] [stdout]    |
[INFO] [stdout] 67 |     IoError { cause: io::Error },
[INFO] [stdout]    |     -------   ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DatastoreError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `cause` is never read
[INFO] [stdout]   --> src/datastore.rs:68:18
[INFO] [stdout]    |
[INFO] [stdout] 68 |     ParseError { cause: FromUtf8Error },
[INFO] [stdout]    |     ----------   ^^^^^
[INFO] [stdout]    |     |
[INFO] [stdout]    |     field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `DatastoreError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `list_keys`, `merge`, and `sync` are never used
[INFO] [stdout]    --> src/datastore.rs:182:8
[INFO] [stdout]     |
[INFO] [stdout]  86 | impl<'a> Datastore<'a> {
[INFO] [stdout]     | ---------------------- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 182 |     fn list_keys(&'a self) -> Keys<'a> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 190 |     fn merge(&mut self) -> Result<(), DatastoreError> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 196 |     pub fn sync(&mut self) -> Result<(), DatastoreError> {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<DataHeader, Infallible>
[INFO] [stdout]    --> src/datastore.rs:138:38
[INFO] [stdout]     |
[INFO] [stdout] 138 |             let header: DataHeader = header_buf.try_into().unwrap();
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-bitcasket` (bin "rust-bitcasket") due to 1 previous error; 5 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "90d076ca8dc24c76c46ad5ba471e5edf8a2be762935633d30930f1e1970c5f3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90d076ca8dc24c76c46ad5ba471e5edf8a2be762935633d30930f1e1970c5f3d", kill_on_drop: false }`
[INFO] [stdout] 90d076ca8dc24c76c46ad5ba471e5edf8a2be762935633d30930f1e1970c5f3d