[INFO] fetching crate tokio-fs 0.1.7...
[INFO] checking tokio-fs-0.1.7 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate tokio-fs 0.1.7 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate tokio-fs 0.1.7 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tokio-fs 0.1.7
[INFO] finished tweaking crates.io crate tokio-fs 0.1.7
[INFO] tweaked toml for crates.io crate tokio-fs 0.1.7 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate tokio-fs 0.1.7 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-executor v0.1.9
[INFO] [stderr]   Downloaded tokio-uds v0.2.6
[INFO] [stderr]   Downloaded crossbeam-epoch v0.8.0
[INFO] [stderr]   Downloaded num_cpus v1.12.0
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.2
[INFO] [stderr]   Downloaded crossbeam-queue v0.2.1
[INFO] [stderr]   Downloaded lock_api v0.3.3
[INFO] [stderr]   Downloaded memoffset v0.5.3
[INFO] [stderr]   Downloaded crossbeam-utils v0.7.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7759234a83c414af6158b74c54ed661c191e816601df8797be9253c44c96e42e
[INFO] running `Command { std: "docker" "start" "-a" "7759234a83c414af6158b74c54ed661c191e816601df8797be9253c44c96e42e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7759234a83c414af6158b74c54ed661c191e816601df8797be9253c44c96e42e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7759234a83c414af6158b74c54ed661c191e816601df8797be9253c44c96e42e", kill_on_drop: false }`
[INFO] [stdout] 7759234a83c414af6158b74c54ed661c191e816601df8797be9253c44c96e42e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22cbafb0ff30825c36bca0228eae42e13baf17f5c16be21cf97fa965d4b461c8
[INFO] running `Command { std: "docker" "start" "-a" "22cbafb0ff30825c36bca0228eae42e13baf17f5c16be21cf97fa965d4b461c8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking futures v0.1.29
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling memoffset v0.5.3
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking crossbeam-deque v0.7.2
[INFO] [stderr]     Checking tokio-executor v0.1.9
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking tokio-current-thread v0.1.6
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio-uds v0.2.6
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio-fs v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/file/open_options.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/read.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/write.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/read.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/write.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/dir.rs:18:15
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pool::run({ create_dir(new_dir.clone()) });
[INFO] [stdout]    |               ^^                           ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 18 -     pool::run({ create_dir(new_dir.clone()) });
[INFO] [stdout] 18 +     pool::run(create_dir(new_dir.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/dir.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pool::run({ create_dir_all(new_dir.clone()) });
[INFO] [stdout]    |               ^^                               ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 28 -     pool::run({ create_dir_all(new_dir.clone()) });
[INFO] [stdout] 28 +     pool::run(create_dir_all(new_dir.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/dir.rs:40:15
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pool::run({ remove_dir(new_dir.clone()) });
[INFO] [stdout]    |               ^^                           ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 40 -     pool::run({ remove_dir(new_dir.clone()) });
[INFO] [stdout] 40 +     pool::run(remove_dir(new_dir.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:25:15
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pool::run({ hard_link(src, dst.clone()) });
[INFO] [stdout]    |               ^^                           ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 25 -     pool::run({ hard_link(src, dst.clone()) });
[INFO] [stdout] 25 +     pool::run(hard_link(src, dst.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:50:15
[INFO] [stdout]    |
[INFO] [stdout] 50 |     pool::run({ os::unix::symlink(src.clone(), dst.clone()) });
[INFO] [stdout]    |               ^^                                           ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 50 -     pool::run({ os::unix::symlink(src.clone(), dst.clone()) });
[INFO] [stdout] 50 +     pool::run(os::unix::symlink(src.clone(), dst.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:62:15
[INFO] [stdout]    |
[INFO] [stdout] 62 |     pool::run({ read_link(dst.clone()).map(move |x| assert!(x == src)) });
[INFO] [stdout]    |               ^^                                                      ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 62 -     pool::run({ read_link(dst.clone()).map(move |x| assert!(x == src)) });
[INFO] [stdout] 62 +     pool::run(read_link(dst.clone()).map(move |x| assert!(x == src)));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:63:15
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pool::run({ symlink_metadata(dst.clone()).map(move |x| assert!(x.file_type().is_symlink())) });
[INFO] [stdout]    |               ^^                                                                               ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 63 -     pool::run({ symlink_metadata(dst.clone()).map(move |x| assert!(x.file_type().is_symlink())) });
[INFO] [stdout] 63 +     pool::run(symlink_metadata(dst.clone()).map(move |x| assert!(x.file_type().is_symlink())));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/file/open_options.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/read.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/write.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/read.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/write.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.84s
[INFO] running `Command { std: "docker" "inspect" "22cbafb0ff30825c36bca0228eae42e13baf17f5c16be21cf97fa965d4b461c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22cbafb0ff30825c36bca0228eae42e13baf17f5c16be21cf97fa965d4b461c8", kill_on_drop: false }`
[INFO] [stdout] 22cbafb0ff30825c36bca0228eae42e13baf17f5c16be21cf97fa965d4b461c8
[INFO] checking tokio-fs-0.1.7 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate tokio-fs 0.1.7 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate tokio-fs 0.1.7 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate tokio-fs 0.1.7
[INFO] finished tweaking crates.io crate tokio-fs 0.1.7
[INFO] tweaked toml for crates.io crate tokio-fs 0.1.7 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate tokio-fs 0.1.7 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d23e01ef3edbc327d0bbd460d4177767801a63dc7e06ff79aa012d66e56a52eb
[INFO] running `Command { std: "docker" "start" "-a" "d23e01ef3edbc327d0bbd460d4177767801a63dc7e06ff79aa012d66e56a52eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d23e01ef3edbc327d0bbd460d4177767801a63dc7e06ff79aa012d66e56a52eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d23e01ef3edbc327d0bbd460d4177767801a63dc7e06ff79aa012d66e56a52eb", kill_on_drop: false }`
[INFO] [stdout] d23e01ef3edbc327d0bbd460d4177767801a63dc7e06ff79aa012d66e56a52eb
[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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f112401b025559ac5df330c2ee43f1f026e4ce9c2283ac6d21f0cef4a77c83f
[INFO] running `Command { std: "docker" "start" "-a" "1f112401b025559ac5df330c2ee43f1f026e4ce9c2283ac6d21f0cef4a77c83f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]     Checking futures v0.1.29
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]    Compiling memoffset v0.5.3
[INFO] [stderr]     Checking smallvec v0.6.13
[INFO] [stderr]     Checking lock_api v0.3.3
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking parking_lot_core v0.6.2
[INFO] [stderr]     Checking tokio-executor v0.1.9
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking crossbeam-deque v0.7.2
[INFO] [stderr]     Checking tokio-current-thread v0.1.6
[INFO] [stderr]     Checking tokio-timer v0.2.13
[INFO] [stderr]     Checking parking_lot v0.9.0
[INFO] [stderr]     Checking tokio-threadpool v0.1.18
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio-fs v0.1.7 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/file/open_options.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/read.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/write.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/read.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/write.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tokio-udp v0.1.6
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking tokio-uds v0.2.6
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/file/open_options.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/read.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `tokio_io` is imported redundantly
[INFO] [stdout]   --> src/write.rs:3:5
[INFO] [stdout]    |
[INFO] [stdout] 3  | use tokio_io;
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:33:1
[INFO] [stdout]    |
[INFO] [stdout] 33 | extern crate tokio_io;
[INFO] [stdout]    | ---------------------- the item `tokio_io` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:25:15
[INFO] [stdout]    |
[INFO] [stdout] 25 |     pool::run({ hard_link(src, dst.clone()) });
[INFO] [stdout]    |               ^^                           ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 25 -     pool::run({ hard_link(src, dst.clone()) });
[INFO] [stdout] 25 +     pool::run(hard_link(src, dst.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:50:15
[INFO] [stdout]    |
[INFO] [stdout] 50 |     pool::run({ os::unix::symlink(src.clone(), dst.clone()) });
[INFO] [stdout]    |               ^^                                           ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 50 -     pool::run({ os::unix::symlink(src.clone(), dst.clone()) });
[INFO] [stdout] 50 +     pool::run(os::unix::symlink(src.clone(), dst.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:62:15
[INFO] [stdout]    |
[INFO] [stdout] 62 |     pool::run({ read_link(dst.clone()).map(move |x| assert!(x == src)) });
[INFO] [stdout]    |               ^^                                                      ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 62 -     pool::run({ read_link(dst.clone()).map(move |x| assert!(x == src)) });
[INFO] [stdout] 62 +     pool::run(read_link(dst.clone()).map(move |x| assert!(x == src)));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/link.rs:63:15
[INFO] [stdout]    |
[INFO] [stdout] 63 |     pool::run({ symlink_metadata(dst.clone()).map(move |x| assert!(x.file_type().is_symlink())) });
[INFO] [stdout]    |               ^^                                                                               ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 63 -     pool::run({ symlink_metadata(dst.clone()).map(move |x| assert!(x.file_type().is_symlink())) });
[INFO] [stdout] 63 +     pool::run(symlink_metadata(dst.clone()).map(move |x| assert!(x.file_type().is_symlink())));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/dir.rs:18:15
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pool::run({ create_dir(new_dir.clone()) });
[INFO] [stdout]    |               ^^                           ^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 18 -     pool::run({ create_dir(new_dir.clone()) });
[INFO] [stdout] 18 +     pool::run(create_dir(new_dir.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/dir.rs:28:15
[INFO] [stdout]    |
[INFO] [stdout] 28 |     pool::run({ create_dir_all(new_dir.clone()) });
[INFO] [stdout]    |               ^^                               ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 28 -     pool::run({ create_dir_all(new_dir.clone()) });
[INFO] [stdout] 28 +     pool::run(create_dir_all(new_dir.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around function argument
[INFO] [stdout]   --> tests/dir.rs:40:15
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pool::run({ remove_dir(new_dir.clone()) });
[INFO] [stdout]    |               ^^                           ^^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these braces
[INFO] [stdout]    |
[INFO] [stdout] 40 -     pool::run({ remove_dir(new_dir.clone()) });
[INFO] [stdout] 40 +     pool::run(remove_dir(new_dir.clone()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/read.rs:71:9
[INFO] [stdout]    |
[INFO] [stdout] 71 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 71 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/write.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 68 |         let _ = mem::replace(&mut self.state, new_state);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.13s
[INFO] running `Command { std: "docker" "inspect" "1f112401b025559ac5df330c2ee43f1f026e4ce9c2283ac6d21f0cef4a77c83f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f112401b025559ac5df330c2ee43f1f026e4ce9c2283ac6d21f0cef4a77c83f", kill_on_drop: false }`
[INFO] [stdout] 1f112401b025559ac5df330c2ee43f1f026e4ce9c2283ac6d21f0cef4a77c83f