[INFO] crate serdeconv 0.3.0 is already in cache
[INFO] extracting crate serdeconv 0.3.0 into work/ex/clippy-test-run/sources/stable/reg/serdeconv/0.3.0
[INFO] extracting crate serdeconv 0.3.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/serdeconv/0.3.0
[INFO] validating manifest of serdeconv-0.3.0 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of serdeconv-0.3.0 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing serdeconv-0.3.0
[INFO] finished frobbing serdeconv-0.3.0
[INFO] frobbed toml for serdeconv-0.3.0 written to work/ex/clippy-test-run/sources/stable/reg/serdeconv/0.3.0/Cargo.toml
[INFO] started frobbing serdeconv-0.3.0
[INFO] finished frobbing serdeconv-0.3.0
[INFO] frobbed toml for serdeconv-0.3.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/serdeconv/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting serdeconv-0.3.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-0/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/serdeconv/0.3.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 617e44f2e5ea2da18f62414388f5cbcddddf430f3f2c50d1f262d03fe18b43b4
[INFO] running `"docker" "start" "-a" "617e44f2e5ea2da18f62414388f5cbcddddf430f3f2c50d1f262d03fe18b43b4"`
[INFO] [stderr]    Compiling trackable_derive v0.1.2
[INFO] [stderr]     Checking trackable v0.2.21
[INFO] [stderr]     Checking serdeconv v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: this let-binding has unit value. Consider omitting `let json =`
[INFO] [stderr]   --> src/convert_json.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     let json = track!(serde_json::to_writer(writer, value).map_err(Error::from))?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::let_unit_value)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
[INFO] [stderr] 
[INFO] [stderr] warning: passing a unit value to a function
[INFO] [stderr]   --> src/convert_json.rs:64:8
[INFO] [stderr]    |
[INFO] [stderr] 64 |     Ok(json)
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unit_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stderr] help: if you intended to pass a unit value, use a unit literal instead
[INFO] [stderr]    |
[INFO] [stderr] 64 |     Ok(())
[INFO] [stderr]    |        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: this let-binding has unit value. Consider omitting `let json =`
[INFO] [stderr]   --> src/convert_json.rs:73:5
[INFO] [stderr]    |
[INFO] [stderr] 73 | /     let json = track!(serde_json::to_writer_pretty(writer, value).map_err(
[INFO] [stderr] 74 | |         Error::from,
[INFO] [stderr] 75 | |     ))?;
[INFO] [stderr]    | |________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
[INFO] [stderr] 
[INFO] [stderr] warning: passing a unit value to a function
[INFO] [stderr]   --> src/convert_json.rs:76:8
[INFO] [stderr]    |
[INFO] [stderr] 76 |     Ok(json)
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stderr] help: if you intended to pass a unit value, use a unit literal instead
[INFO] [stderr]    |
[INFO] [stderr] 76 |     Ok(())
[INFO] [stderr]    |        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: this let-binding has unit value. Consider omitting `let json =`
[INFO] [stderr]   --> src/convert_json.rs:63:5
[INFO] [stderr]    |
[INFO] [stderr] 63 |     let json = track!(serde_json::to_writer(writer, value).map_err(Error::from))?;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::let_unit_value)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
[INFO] [stderr] 
[INFO] [stderr] warning: passing a unit value to a function
[INFO] [stderr]   --> src/convert_json.rs:64:8
[INFO] [stderr]    |
[INFO] [stderr] 64 |     Ok(json)
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unit_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stderr] help: if you intended to pass a unit value, use a unit literal instead
[INFO] [stderr]    |
[INFO] [stderr] 64 |     Ok(())
[INFO] [stderr]    |        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: this let-binding has unit value. Consider omitting `let json =`
[INFO] [stderr]   --> src/convert_json.rs:73:5
[INFO] [stderr]    |
[INFO] [stderr] 73 | /     let json = track!(serde_json::to_writer_pretty(writer, value).map_err(
[INFO] [stderr] 74 | |         Error::from,
[INFO] [stderr] 75 | |     ))?;
[INFO] [stderr]    | |________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
[INFO] [stderr] 
[INFO] [stderr] warning: passing a unit value to a function
[INFO] [stderr]   --> src/convert_json.rs:76:8
[INFO] [stderr]    |
[INFO] [stderr] 76 |     Ok(json)
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stderr] help: if you intended to pass a unit value, use a unit literal instead
[INFO] [stderr]    |
[INFO] [stderr] 76 |     Ok(())
[INFO] [stderr]    |        ^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.45s
[INFO] running `"docker" "inspect" "617e44f2e5ea2da18f62414388f5cbcddddf430f3f2c50d1f262d03fe18b43b4"`
[INFO] running `"docker" "rm" "-f" "617e44f2e5ea2da18f62414388f5cbcddddf430f3f2c50d1f262d03fe18b43b4"`
[INFO] [stdout] 617e44f2e5ea2da18f62414388f5cbcddddf430f3f2c50d1f262d03fe18b43b4