[INFO] fetching crate rustc-hex 2.1.0...
[INFO] checking rustc-hex-2.1.0 against master#39cb3386ddc6c71657418be28dbb3987eea4aa4b for pr-133536
[INFO] extracting crate rustc-hex 2.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate rustc-hex 2.1.0 on toolchain 39cb3386ddc6c71657418be28dbb3987eea4aa4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "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-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] acf8fb0ad5f55c51deb48c6cd0d349e9bc9b2cab2774a9ec2b5885ea5200acbb
[INFO] running `Command { std: "docker" "start" "-a" "acf8fb0ad5f55c51deb48c6cd0d349e9bc9b2cab2774a9ec2b5885ea5200acbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "acf8fb0ad5f55c51deb48c6cd0d349e9bc9b2cab2774a9ec2b5885ea5200acbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acf8fb0ad5f55c51deb48c6cd0d349e9bc9b2cab2774a9ec2b5885ea5200acbb", kill_on_drop: false }`
[INFO] [stdout] acf8fb0ad5f55c51deb48c6cd0d349e9bc9b2cab2774a9ec2b5885ea5200acbb
[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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7a1aad9b45fc7786a6288b134a59246254dcb4e0b5d4f2d277cf0942d7458c8e
[INFO] running `Command { std: "docker" "start" "-a" "7a1aad9b45fc7786a6288b134a59246254dcb4e0b5d4f2d277cf0942d7458c8e", 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 of the type parameter `T` declared on the method `to_hex`
[INFO] [stdout]    |
[INFO] [stdout]    = note: multiple `impl`s satisfying `_: FromIterator<char>` found in the `alloc` crate:
[INFO] [stdout]            - impl FromIterator<char> for Box<str>;
[INFO] [stdout]            - impl FromIterator<char> for String;
[INFO] [stdout] note: required by a bound in `to_hex`
[INFO] [stdout]   --> /opt/rustwide/workdir/src/lib.rs:25:18
[INFO] [stdout]    |
[INFO] [stdout] 25 |     fn to_hex<T: FromIterator<char>>(&self) -> T;
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^ required by this bound in `ToHex::to_hex`
[INFO] [stdout] help: consider specifying the generic argument
[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:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let sb = s.as_bytes().to_hex();
[INFO] [stdout]    |         ^^
[INFO] [stdout] 24 |     b.iter(|| {
[INFO] [stdout] 25 |         sb.from_hex().unwrap();
[INFO] [stdout]    |         -- type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout] help: consider giving `sb` an explicit type
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let sb: /* Type */ = s.as_bytes().to_hex();
[INFO] [stdout]    |           ++++++++++++
[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` (bench "hex") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "7a1aad9b45fc7786a6288b134a59246254dcb4e0b5d4f2d277cf0942d7458c8e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a1aad9b45fc7786a6288b134a59246254dcb4e0b5d4f2d277cf0942d7458c8e", kill_on_drop: false }`
[INFO] [stdout] 7a1aad9b45fc7786a6288b134a59246254dcb4e0b5d4f2d277cf0942d7458c8e
