[INFO] fetching crate rustc-hex 2.1.0...
[INFO] checking rustc-hex-2.1.0 against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] extracting crate rustc-hex 2.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate rustc-hex 2.1.0 on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustc-hex 2.1.0
[INFO] finished tweaking crates.io crate rustc-hex 2.1.0
[INFO] tweaked toml for crates.io crate rustc-hex 2.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bd15025ca05403ef8738804eaedf2ef40823e96dff07051301814b277c0c898d
[INFO] running `Command { std: "docker" "start" "-a" "bd15025ca05403ef8738804eaedf2ef40823e96dff07051301814b277c0c898d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd15025ca05403ef8738804eaedf2ef40823e96dff07051301814b277c0c898d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd15025ca05403ef8738804eaedf2ef40823e96dff07051301814b277c0c898d", kill_on_drop: false }`
[INFO] [stdout] bd15025ca05403ef8738804eaedf2ef40823e96dff07051301814b277c0c898d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] db28fe7ef7690942d5d51940d75632473e5af288cbbde6aa720e91856362ea2b
[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" "db28fe7ef7690942d5d51940d75632473e5af288cbbde6aa720e91856362ea2b", kill_on_drop: false }`
[INFO] [stderr]     Checking rustc-hex v2.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> benches/hex.rs:14:22
[INFO] [stdout]    |
[INFO] [stdout] 14 |         s.as_bytes().to_hex();
[INFO] [stdout]    |                      ^^^^^^ cannot infer type for type parameter `T` declared on the associated function `to_hex`
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: FromIterator<char>`
[INFO] [stdout] help: consider specifying the type argument in the method call
[INFO] [stdout]    |
[INFO] [stdout] 14 |         s.as_bytes().to_hex::<T>();
[INFO] [stdout]    |                            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> benches/hex.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let sb = s.as_bytes().to_hex();
[INFO] [stdout]    |         -- consider giving `sb` a type
[INFO] [stdout] 24 |     b.iter(|| {
[INFO] [stdout] 25 |         sb.from_hex().unwrap();
[INFO] [stdout]    |         ^^ cannot infer type
[INFO] [stdout]    |
[INFO] [stdout]    = note: type must be known at this point
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `FromHex`
[INFO] [stdout]  --> benches/hex.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 | use hex::{FromHex, ToHex};
[INFO] [stdout]   |           ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0282, E0283.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-hex`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "db28fe7ef7690942d5d51940d75632473e5af288cbbde6aa720e91856362ea2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db28fe7ef7690942d5d51940d75632473e5af288cbbde6aa720e91856362ea2b", kill_on_drop: false }`
[INFO] [stdout] db28fe7ef7690942d5d51940d75632473e5af288cbbde6aa720e91856362ea2b