[INFO] updating cached repository https://github.com/rhodium45/blockchain
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 32cd3a16944cd37393a311314ad157a3a7f621ab
[INFO] checking rhodium45/blockchain against try#e689e5eaefe96e6dc3ed5bb629c521b7d207aff7 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Frhodium45%2Fblockchain" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rhodium45/blockchain on toolchain e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/rhodium45/blockchain
[INFO] finished tweaking git repo https://github.com/rhodium45/blockchain
[INFO] tweaked toml for git repo https://github.com/rhodium45/blockchain written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/rhodium45/blockchain already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e689e5eaefe96e6dc3ed5bb629c521b7d207aff7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 3724382f93890d7e91c206f12fc9398fec147e80755de0c39184b50dafe3edff
[INFO] running `"docker" "start" "-a" "3724382f93890d7e91c206f12fc9398fec147e80755de0c39184b50dafe3edff"`
[INFO] [stderr]    Compiling syn v0.13.1
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]    Compiling serde_derive v1.0.42
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/blockchain.rs:171:9
[INFO] [stderr]     |
[INFO] [stderr] 169 |       pub fn hex_to_string(vec_res: &[u8]) -> String {
[INFO] [stderr]     |                                               ------ expected `std::string::String` because of return type
[INFO] [stderr] 170 |           let mut s = String::new();
[INFO] [stderr] 171 | /         for b in vec_res {
[INFO] [stderr] 172 | |             write!(&mut s, "{:x}", b).expect("unable to write");
[INFO] [stderr] 173 | |         }
[INFO] [stderr]     | |_________^ expected struct `std::string::String`, found ()
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `std::string::String`
[INFO] [stderr]                found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `blockchain`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/blockchain.rs:171:9
[INFO] [stderr]     |
[INFO] [stderr] 169 |       pub fn hex_to_string(vec_res: &[u8]) -> String {
[INFO] [stderr]     |                                               ------ expected `std::string::String` because of return type
[INFO] [stderr] 170 |           let mut s = String::new();
[INFO] [stderr] 171 | /         for b in vec_res {
[INFO] [stderr] 172 | |             write!(&mut s, "{:x}", b).expect("unable to write");
[INFO] [stderr] 173 | |         }
[INFO] [stderr]     | |_________^ expected struct `std::string::String`, found ()
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `std::string::String`
[INFO] [stderr]                found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `blockchain`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3724382f93890d7e91c206f12fc9398fec147e80755de0c39184b50dafe3edff"`
[INFO] running `"docker" "rm" "-f" "3724382f93890d7e91c206f12fc9398fec147e80755de0c39184b50dafe3edff"`
[INFO] [stdout] 3724382f93890d7e91c206f12fc9398fec147e80755de0c39184b50dafe3edff