[INFO] fetching crate fuzzcheck 0.13.0...
[INFO] testing fuzzcheck-0.13.0 against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] extracting crate fuzzcheck 0.13.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate fuzzcheck 0.13.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate fuzzcheck 0.13.0
[INFO] tweaked toml for crates.io crate fuzzcheck 0.13.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fuzzcheck 0.13.0 on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "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" "+b83b707f97d809763b7861afa7638871f3339a33" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 46 packages to latest compatible versions
[INFO] [stderr]       Adding ahash v0.7.8 (available: v0.8.12)
[INFO] [stderr]       Adding bit-vec v0.6.3 (available: v0.8.0)
[INFO] [stderr]       Adding fastrand v1.9.0 (available: v2.3.0)
[INFO] [stderr]       Adding md5 v0.7.0 (available: v0.8.0)
[INFO] [stderr]       Adding nu-ansi-term v0.46.0 (available: v0.50.1)
[INFO] [stderr]       Adding object v0.29.0 (available: v0.37.3)
[INFO] [stderr]       Adding regex-syntax v0.6.29 (available: v0.8.6)
[INFO] [stderr]       Adding ron v0.7.1 (available: v0.11.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04f64985e1fee96e7c7c46f19fe509d763422c46cc05acea448884a7a8abea1f
[INFO] running `Command { std: "docker" "start" "-a" "04f64985e1fee96e7c7c46f19fe509d763422c46cc05acea448884a7a8abea1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04f64985e1fee96e7c7c46f19fe509d763422c46cc05acea448884a7a8abea1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04f64985e1fee96e7c7c46f19fe509d763422c46cc05acea448884a7a8abea1f", kill_on_drop: false }`
[INFO] [stdout] 04f64985e1fee96e7c7c46f19fe509d763422c46cc05acea448884a7a8abea1f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dbe9f17efc82c2e511bdf76183f7e6023d6211c3ce0eb6f31c85988b95302e01
[INFO] running `Command { std: "docker" "start" "-a" "dbe9f17efc82c2e511bdf76183f7e6023d6211c3ce0eb6f31c85988b95302e01", kill_on_drop: false }`
[INFO] [stderr]    Compiling crc32fast v1.5.0
[INFO] [stderr]    Compiling unicode-width v0.2.1
[INFO] [stderr]    Compiling ahash v0.7.8
[INFO] [stderr]    Compiling object v0.29.0
[INFO] [stderr]    Compiling md5 v0.7.0
[INFO] [stderr]    Compiling fastrand v1.9.0
[INFO] [stderr]    Compiling bit-vec v0.6.3
[INFO] [stderr]    Compiling libz-sys v1.1.22
[INFO] [stderr]    Compiling fuzzcheck v0.13.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling rustc-demangle v0.1.26
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling getrandom v0.2.16
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling getopts v0.2.24
[INFO] [stderr]    Compiling flate2 v1.1.2
[INFO] [stderr]    Compiling fuzzcheck_common v0.13.0
[INFO] [stderr]    Compiling fuzzcheck_mutators_derive v0.13.0
[INFO] [stdout] error: let chains are only allowed in Rust 2024 or later
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/fuzzcheck_mutators_derive-0.13.0/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] [stderr] error: could not compile `fuzzcheck_mutators_derive` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "dbe9f17efc82c2e511bdf76183f7e6023d6211c3ce0eb6f31c85988b95302e01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbe9f17efc82c2e511bdf76183f7e6023d6211c3ce0eb6f31c85988b95302e01", kill_on_drop: false }`
[INFO] [stdout] dbe9f17efc82c2e511bdf76183f7e6023d6211c3ce0eb6f31c85988b95302e01