[INFO] updating cached repository https://github.com/twinair/rustcask
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] [stderr] From https://github.com/twinair/rustcask
[INFO] [stderr]    9f8d686..54515a9  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 54515a9105343aae88169a21fdd919c701bf4529
[INFO] checking twinair/rustcask against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftwinair%2Frustcask" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/twinair/rustcask on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/twinair/rustcask
[INFO] finished tweaking git repo https://github.com/twinair/rustcask
[INFO] tweaked toml for git repo https://github.com/twinair/rustcask written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/twinair/rustcask already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-2/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" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] e56508cdd99c74bb782d84a18827129fb01c5a65381636bd3bb49c0988cd41a9
[INFO] running `"docker" "start" "-a" "e56508cdd99c74bb782d84a18827129fb01c5a65381636bd3bb49c0988cd41a9"`
[INFO] [stderr]    Compiling proc-macro2 v1.0.2
[INFO] [stderr]     Checking float-cmp v0.4.0
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking predicates v1.0.1
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling syn v1.0.5
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]     Checking serde v1.0.99
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking escargot v0.4.0
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stderr]     Checking kvs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `crate::RustCaskError`
[INFO] [stderr]  --> src/kv.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::RustCaskError;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::RustCaskError`
[INFO] [stderr]  --> src/kv.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::RustCaskError;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]   --> src/kv.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn open(path: &Path) -> Result<KvStore> {
[INFO] [stderr]    |                 ^^^^ help: consider prefixing with an underscore: `_path`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `path`
[INFO] [stderr]   --> src/kv.rs:39:17
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn open(path: &Path) -> Result<KvStore> {
[INFO] [stderr]    |                 ^^^^ help: consider prefixing with an underscore: `_path`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/kvs.rs:38:9
[INFO] [stderr]    |
[INFO] [stderr] 38 |         store.set(key.to_owned(), value.to_owned());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/bin/kvs.rs:38:9
[INFO] [stderr]    |
[INFO] [stderr] 38 |         store.set(key.to_owned(), value.to_owned());
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> tests/tests.rs:194:9
[INFO] [stderr]     |
[INFO] [stderr] 194 |     let mut store = KvStore::open(temp_dir.path())?;
[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]    --> tests/tests.rs:233:9
[INFO] [stderr]     |
[INFO] [stderr] 233 |     let mut store = KvStore::open(temp_dir.path())?;
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> tests/tests.rs:292:13
[INFO] [stderr]     |
[INFO] [stderr] 292 |         let mut store = KvStore::open(temp_dir.path())?;
[INFO] [stderr]     |             ----^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 50.63s
[INFO] running `"docker" "inspect" "e56508cdd99c74bb782d84a18827129fb01c5a65381636bd3bb49c0988cd41a9"`
[INFO] running `"docker" "rm" "-f" "e56508cdd99c74bb782d84a18827129fb01c5a65381636bd3bb49c0988cd41a9"`
[INFO] [stdout] e56508cdd99c74bb782d84a18827129fb01c5a65381636bd3bb49c0988cd41a9