[INFO] crate rustc-hex 2.0.1 is already in cache
[INFO] extracting crate rustc-hex 2.0.1 into work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/reg/rustc-hex/2.0.1
[INFO] extracting crate rustc-hex 2.0.1 into work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/reg/rustc-hex/2.0.1
[INFO] validating manifest of rustc-hex-2.0.1 on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rustc-hex-2.0.1 on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rustc-hex-2.0.1
[INFO] finished frobbing rustc-hex-2.0.1
[INFO] frobbed toml for rustc-hex-2.0.1 written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/reg/rustc-hex/2.0.1/Cargo.toml
[INFO] started frobbing rustc-hex-2.0.1
[INFO] finished frobbing rustc-hex-2.0.1
[INFO] frobbed toml for rustc-hex-2.0.1 written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/reg/rustc-hex/2.0.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking rustc-hex-2.0.1 against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-1/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/reg/rustc-hex/2.0.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5b5680f9771c1e22c89015d34e61e4351802e75b3f437db8b74dc8e25d292af4
[INFO] running `"docker" "start" "-a" "5b5680f9771c1e22c89015d34e61e4351802e75b3f437db8b74dc8e25d292af4"`
[INFO] [stderr]     Checking rustc-hex v2.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0283]: type annotations required: cannot resolve `_: std::iter::FromIterator<char>`
[INFO] [stderr]   --> benches/hex.rs:14:22
[INFO] [stderr]    |
[INFO] [stderr] 14 |         s.as_bytes().to_hex();
[INFO] [stderr]    |                      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]   --> benches/hex.rs:25:9
[INFO] [stderr]    |
[INFO] [stderr] 23 |     let sb = s.as_bytes().to_hex();
[INFO] [stderr]    |         -- consider giving `sb` a type
[INFO] [stderr] 24 |     b.iter(|| {
[INFO] [stderr] 25 |         sb.from_hex().unwrap();
[INFO] [stderr]    |         ^^ cannot infer type
[INFO] [stderr]    |
[INFO] [stderr]    = note: type must be known at this point
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors occurred: E0282, E0283.
[INFO] [stderr] For more information about an error, try `rustc --explain E0282`.
[INFO] [stderr] error: Could not compile `rustc-hex`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5b5680f9771c1e22c89015d34e61e4351802e75b3f437db8b74dc8e25d292af4"`
[INFO] running `"docker" "rm" "-f" "5b5680f9771c1e22c89015d34e61e4351802e75b3f437db8b74dc8e25d292af4"`
[INFO] [stdout] 5b5680f9771c1e22c89015d34e61e4351802e75b3f437db8b74dc8e25d292af4