[INFO] fetching crate fuzzcheck 0.4.0...
[INFO] checking fuzzcheck-0.4.0 against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] extracting crate fuzzcheck 0.4.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate fuzzcheck 0.4.0 on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fuzzcheck 0.4.0
[INFO] finished tweaking crates.io crate fuzzcheck 0.4.0
[INFO] tweaked toml for crates.io crate fuzzcheck 0.4.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d76a7c9fc499a3a5e27802e1756920eb9fc252c7ed20321afd366b20666273bb
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d76a7c9fc499a3a5e27802e1756920eb9fc252c7ed20321afd366b20666273bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d76a7c9fc499a3a5e27802e1756920eb9fc252c7ed20321afd366b20666273bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d76a7c9fc499a3a5e27802e1756920eb9fc252c7ed20321afd366b20666273bb", kill_on_drop: false }`
[INFO] [stdout] d76a7c9fc499a3a5e27802e1756920eb9fc252c7ed20321afd366b20666273bb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5e92a00889b406a2727866f45cdda7bea0d6be2126e2e645016896cf305e94a2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "5e92a00889b406a2727866f45cdda7bea0d6be2126e2e645016896cf305e94a2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking fuzzcheck_traits v0.4.0
[INFO] [stderr]     Checking fastrand v1.4.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking fuzzcheck_arg_parser v0.4.0
[INFO] [stderr]     Checking fuzzcheck v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: constant is never used: `EWOULDBLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:816:5
[INFO] [stdout]     |
[INFO] [stdout] 816 |     pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EDEADLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:817:5
[INFO] [stdout]     |
[INFO] [stdout] 817 |     pub const EDEADLOCK: Errno = Errno::EDEADLK;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ENOTSUP`
[INFO] [stdout]    --> src/nix_subset/errno.rs:818:5
[INFO] [stdout]     |
[INFO] [stdout] 818 |     pub const ENOTSUP: Errno = Errno::EOPNOTSUPP;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `type_of_thread_id`
[INFO] [stdout]    --> src/nix_subset/signal.rs:423:1
[INFO] [stdout]     |
[INFO] [stdout] 423 | pub type type_of_thread_id = libc::pid_t;
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `ptr_offset_from` has been stable since 1.47.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(ptr_offset_from)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EWOULDBLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:816:5
[INFO] [stdout]     |
[INFO] [stdout] 816 |     pub const EWOULDBLOCK: Errno = Errno::EAGAIN;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `EDEADLOCK`
[INFO] [stdout]    --> src/nix_subset/errno.rs:817:5
[INFO] [stdout]     |
[INFO] [stdout] 817 |     pub const EDEADLOCK: Errno = Errno::EDEADLK;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ENOTSUP`
[INFO] [stdout]    --> src/nix_subset/errno.rs:818:5
[INFO] [stdout]     |
[INFO] [stdout] 818 |     pub const ENOTSUP: Errno = Errno::EOPNOTSUPP;
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `type_of_thread_id`
[INFO] [stdout]    --> src/nix_subset/signal.rs:423:1
[INFO] [stdout]     |
[INFO] [stdout] 423 | pub type type_of_thread_id = libc::pid_t;
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `ptr_offset_from` has been stable since 1.47.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(ptr_offset_from)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.71s
[INFO] running `Command { std: "docker" "inspect" "5e92a00889b406a2727866f45cdda7bea0d6be2126e2e645016896cf305e94a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e92a00889b406a2727866f45cdda7bea0d6be2126e2e645016896cf305e94a2", kill_on_drop: false }`
[INFO] [stdout] 5e92a00889b406a2727866f45cdda7bea0d6be2126e2e645016896cf305e94a2