[INFO] updating cached repository rhodium45/blockchain
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rhodium45/blockchain
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rhodium45/blockchain" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/rhodium45/blockchain"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/rhodium45/blockchain'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rhodium45/blockchain" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/rhodium45/blockchain"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/rhodium45/blockchain'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 32cd3a16944cd37393a311314ad157a3a7f621ab
[INFO] sha for GitHub repo rhodium45/blockchain: 32cd3a16944cd37393a311314ad157a3a7f621ab
[INFO] validating manifest of rhodium45/blockchain on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rhodium45/blockchain on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rhodium45/blockchain
[INFO] finished frobbing rhodium45/blockchain
[INFO] frobbed toml for rhodium45/blockchain written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/rhodium45/blockchain/Cargo.toml
[INFO] started frobbing rhodium45/blockchain
[INFO] finished frobbing rhodium45/blockchain
[INFO] frobbed toml for rhodium45/blockchain written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/rhodium45/blockchain/Cargo.toml
[INFO] crate rhodium45/blockchain already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking rhodium45/blockchain against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-0/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/rhodium45/blockchain:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 164a2c9d3a76bafaed965868e6cfc383394eaca4846154a0d773410a0bc02a71
[INFO] running `"docker" "start" "-a" "164a2c9d3a76bafaed965868e6cfc383394eaca4846154a0d773410a0bc02a71"`
[INFO] [stderr]     Checking serde_json v1.0.16
[INFO] [stderr]    Compiling serde_derive v1.0.42
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/crater/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" "164a2c9d3a76bafaed965868e6cfc383394eaca4846154a0d773410a0bc02a71"`
[INFO] running `"docker" "rm" "-f" "164a2c9d3a76bafaed965868e6cfc383394eaca4846154a0d773410a0bc02a71"`
[INFO] [stdout] 164a2c9d3a76bafaed965868e6cfc383394eaca4846154a0d773410a0bc02a71