[INFO] fetching crate fuzzcheck_mutators_derive 0.13.0...
[INFO] checking fuzzcheck_mutators_derive-0.13.0 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate fuzzcheck_mutators_derive 0.13.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate fuzzcheck_mutators_derive 0.13.0
[INFO] finished tweaking crates.io crate fuzzcheck_mutators_derive 0.13.0
[INFO] tweaked toml for crates.io crate fuzzcheck_mutators_derive 0.13.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate fuzzcheck_mutators_derive 0.13.0 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.106)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 69bd1e1f86d4b4a618376b6044bff915df90b7f8488f29351eea540ec0550624
[INFO] running `Command { std: "docker" "start" "-a" "69bd1e1f86d4b4a618376b6044bff915df90b7f8488f29351eea540ec0550624", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "69bd1e1f86d4b4a618376b6044bff915df90b7f8488f29351eea540ec0550624", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69bd1e1f86d4b4a618376b6044bff915df90b7f8488f29351eea540ec0550624", kill_on_drop: false }`
[INFO] [stdout] 69bd1e1f86d4b4a618376b6044bff915df90b7f8488f29351eea540ec0550624
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bce82258555ccd65cfdfe3bc35cee93f5fc88ba6836fe3481e84ddbf96b5f8ce
[INFO] running `Command { std: "docker" "start" "-a" "bce82258555ccd65cfdfe3bc35cee93f5fc88ba6836fe3481e84ddbf96b5f8ce", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]     Checking unicode-ident v1.0.18
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking quote v1.0.40
[INFO] [stderr]     Checking fuzzcheck_mutators_derive v0.13.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/lib.rs:337:8
[INFO] [stdout]     |
[INFO] [stdout] 337 |     if let Some(ident) = attribute.path.get_ident()
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> src/lib.rs:337:8
[INFO] [stdout]     |
[INFO] [stdout] 337 |     if let Some(ident) = attribute.path.get_ident()
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:240:19
[INFO] [stdout]     |
[INFO] [stdout] 240 |     Mi_j: Box<dyn (Fn(usize, usize) -> Ident)>,
[INFO] [stdout]     |                   ^                         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 240 -     Mi_j: Box<dyn (Fn(usize, usize) -> Ident)>,
[INFO] [stdout] 240 +     Mi_j: Box<dyn Fn(usize, usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:241:17
[INFO] [stdout]     |
[INFO] [stdout] 241 |     Mi: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                 ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 241 -     Mi: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 241 +     Mi: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:242:24
[INFO] [stdout]     |
[INFO] [stdout] 242 |     mutator_i: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                        ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 242 -     mutator_i: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 242 +     mutator_i: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:248:17
[INFO] [stdout]     |
[INFO] [stdout] 248 |     ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                 ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 248 -     ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 248 +     ti: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:249:23
[INFO] [stdout]     |
[INFO] [stdout] 249 |     ti_value: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                       ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 249 -     ti_value: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 249 +     ti_value: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:250:17
[INFO] [stdout]     |
[INFO] [stdout] 250 |     Ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                 ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 250 -     Ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 250 +     Ti: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:251:21
[INFO] [stdout]     |
[INFO] [stdout] 251 |     Tuplei: Box<dyn (Fn(usize) -> TokenStream)>,
[INFO] [stdout]     |                     ^                        ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 251 -     Tuplei: Box<dyn (Fn(usize) -> TokenStream)>,
[INFO] [stdout] 251 +     Tuplei: Box<dyn Fn(usize) -> TokenStream>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:240:19
[INFO] [stdout]     |
[INFO] [stdout] 240 |     Mi_j: Box<dyn (Fn(usize, usize) -> Ident)>,
[INFO] [stdout]     |                   ^                         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 240 -     Mi_j: Box<dyn (Fn(usize, usize) -> Ident)>,
[INFO] [stdout] 240 +     Mi_j: Box<dyn Fn(usize, usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:241:17
[INFO] [stdout]     |
[INFO] [stdout] 241 |     Mi: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                 ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 241 -     Mi: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 241 +     Mi: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:242:24
[INFO] [stdout]     |
[INFO] [stdout] 242 |     mutator_i: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                        ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 242 -     mutator_i: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 242 +     mutator_i: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:248:17
[INFO] [stdout]     |
[INFO] [stdout] 248 |     ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                 ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 248 -     ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 248 +     ti: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:249:23
[INFO] [stdout]     |
[INFO] [stdout] 249 |     ti_value: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                       ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 249 -     ti_value: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 249 +     ti_value: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:250:17
[INFO] [stdout]     |
[INFO] [stdout] 250 |     Ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout]     |                 ^                  ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 250 -     Ti: Box<dyn (Fn(usize) -> Ident)>,
[INFO] [stdout] 250 +     Ti: Box<dyn Fn(usize) -> Ident>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:251:21
[INFO] [stdout]     |
[INFO] [stdout] 251 |     Tuplei: Box<dyn (Fn(usize) -> TokenStream)>,
[INFO] [stdout]     |                     ^                        ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 251 -     Tuplei: Box<dyn (Fn(usize) -> TokenStream)>,
[INFO] [stdout] 251 +     Tuplei: Box<dyn Fn(usize) -> TokenStream>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fuzzcheck_mutators_derive` (lib test) due to 1 previous error; 8 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `fuzzcheck_mutators_derive` (lib) due to 1 previous error; 8 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "bce82258555ccd65cfdfe3bc35cee93f5fc88ba6836fe3481e84ddbf96b5f8ce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bce82258555ccd65cfdfe3bc35cee93f5fc88ba6836fe3481e84ddbf96b5f8ce", kill_on_drop: false }`
[INFO] [stdout] bce82258555ccd65cfdfe3bc35cee93f5fc88ba6836fe3481e84ddbf96b5f8ce