[INFO] fetching crate instance-copy-on-write 0.9.1...
[INFO] checking instance-copy-on-write-0.9.1 against master#035b01b794602d5861daa43ac792f372f8981ed7 for 152214-denied-retry-0
[INFO] extracting crate instance-copy-on-write 0.9.1 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate instance-copy-on-write 0.9.1
[INFO] finished tweaking crates.io crate instance-copy-on-write 0.9.1
[INFO] tweaked toml for crates.io crate instance-copy-on-write 0.9.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate instance-copy-on-write 0.9.1 on toolchain 035b01b794602d5861daa43ac792f372f8981ed7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+035b01b794602d5861daa43ac792f372f8981ed7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate instance-copy-on-write 0.9.1 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" "+035b01b794602d5861daa43ac792f372f8981ed7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+035b01b794602d5861daa43ac792f372f8981ed7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e946e688ccd065224928cc2de6197ae4013d7dfde90c94e50258020ecd61c0de
[INFO] running `Command { std: "docker" "start" "-a" "e946e688ccd065224928cc2de6197ae4013d7dfde90c94e50258020ecd61c0de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e946e688ccd065224928cc2de6197ae4013d7dfde90c94e50258020ecd61c0de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e946e688ccd065224928cc2de6197ae4013d7dfde90c94e50258020ecd61c0de", kill_on_drop: false }`
[INFO] [stdout] e946e688ccd065224928cc2de6197ae4013d7dfde90c94e50258020ecd61c0de
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+035b01b794602d5861daa43ac792f372f8981ed7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ed4beb718aa67d0825e45cfa3f0a703f77027cc8ff41f14eda8eff1abc65cb5
[INFO] running `Command { std: "docker" "start" "-a" "3ed4beb718aa67d0825e45cfa3f0a703f77027cc8ff41f14eda8eff1abc65cb5", kill_on_drop: false }`
[INFO] [stderr]     Checking instance-copy-on-write v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/lib.rs:189:34
[INFO] [stdout]     |
[INFO] [stdout] 189 |         struct Test { s: String };
[INFO] [stdout]     |                                  ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read0`
[INFO] [stdout]    --> src/lib.rs:176:17
[INFO] [stdout]     |
[INFO] [stdout] 176 |             let read0 = icow.read();
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_read0`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read1`
[INFO] [stdout]    --> src/lib.rs:221:13
[INFO] [stdout]     |
[INFO] [stdout] 221 |         let read1 = icow.read();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_read1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rc`
[INFO] [stdout]    --> src/lib.rs:425:18
[INFO] [stdout]     |
[INFO] [stdout] 425 |         let (se, rc) = mpsc::channel::<()>();
[INFO] [stdout]     |                  ^^ help: if this is intentional, prefix it with an underscore: `_rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read0`
[INFO] [stdout]    --> src/lib.rs:493:13
[INFO] [stdout]     |
[INFO] [stdout] 493 |         let read0 = icow.read();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_read0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read2`
[INFO] [stdout]    --> src/lib.rs:494:13
[INFO] [stdout]     |
[INFO] [stdout] 494 |         let read2 = icow.read();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_read2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read0`
[INFO] [stdout]    --> src/lib.rs:686:17
[INFO] [stdout]     |
[INFO] [stdout] 686 |             let read0 = icow.read();
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_read0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read2`
[INFO] [stdout]    --> src/lib.rs:687:17
[INFO] [stdout]     |
[INFO] [stdout] 687 |             let read2 = icow.read();
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_read2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `s` is never read
[INFO] [stdout]    --> src/lib.rs:168:23
[INFO] [stdout]     |
[INFO] [stdout] 168 |         struct Test { s: String }
[INFO] [stdout]     |                ----   ^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Test` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `s` is never read
[INFO] [stdout]    --> src/lib.rs:189:23
[INFO] [stdout]     |
[INFO] [stdout] 189 |         struct Test { s: String };
[INFO] [stdout]     |                ----   ^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Test` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:471:17
[INFO] [stdout]     |
[INFO] [stdout] 471 |                 se2.send(());
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 471 |                 let _ = se2.send(());
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "3ed4beb718aa67d0825e45cfa3f0a703f77027cc8ff41f14eda8eff1abc65cb5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ed4beb718aa67d0825e45cfa3f0a703f77027cc8ff41f14eda8eff1abc65cb5", kill_on_drop: false }`
[INFO] [stdout] 3ed4beb718aa67d0825e45cfa3f0a703f77027cc8ff41f14eda8eff1abc65cb5