[INFO] updating cached repository https://github.com/cmyr/ropediff
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/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] e17b2dd8b095eeabf36a5514be99737c3cb9069a
[INFO] testing cmyr/ropediff against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcmyr%2Fropediff" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cmyr/ropediff on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/cmyr/ropediff
[INFO] removed path dependency xi-rope from git repo https://github.com/cmyr/ropediff
[INFO] finished tweaking git repo https://github.com/cmyr/ropediff
[INFO] tweaked toml for git repo https://github.com/cmyr/ropediff written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/cmyr/ropediff already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: dependency (xi-rope) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /big/crater/work/builds/worker-1/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: dependency (xi-rope) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/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=warn" "-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" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 828f22c4d1224000ebfe37ddb77e82366a997777d57a21ccaa4f9efd5ff60850
[INFO] running `"docker" "start" "-a" "828f22c4d1224000ebfe37ddb77e82366a997777d57a21ccaa4f9efd5ff60850"`
[INFO] [stderr] warning: dependency (xi-rope) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling bytecount v0.5.1
[INFO] [stderr]    Compiling suffix v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.6.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.5.2
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling statrs v0.9.0
[INFO] [stderr]    Compiling xi-rope v0.3.0
[INFO] [stderr]    Compiling crossbeam-deque v0.5.2
[INFO] [stderr]    Compiling parking_lot v0.6.4
[INFO] [stderr]    Compiling crossbeam-epoch v0.6.1
[INFO] [stderr]    Compiling crossbeam-channel v0.2.6
[INFO] [stderr]    Compiling crossbeam v0.4.1
[INFO] [stderr]    Compiling ropediff v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `Duration`
[INFO] [stderr]   --> src/main.rs:10:17
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::time::{Duration, Instant};
[INFO] [stderr]    |                 ^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/final_improved.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: the trait bound `xi_rope::Delta<xi_rope::RopeInfo>: serde::Serialize` is not satisfied
[INFO] [stderr]     --> src/main.rs:266:39
[INFO] [stderr]      |
[INFO] [stderr] 266  |     let value = serde_json::to_string(&delta).unwrap();
[INFO] [stderr]      |                                       ^^^^^^ the trait `serde::Serialize` is not implemented for `xi_rope::Delta<xi_rope::RopeInfo>`
[INFO] [stderr]      | 
[INFO] [stderr]     ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.41/src/ser.rs:2224:8
[INFO] [stderr]      |
[INFO] [stderr] 2224 |     T: Serialize,
[INFO] [stderr]      |        --------- required by this bound in `serde_json::to_string`
[INFO] [stderr] 
[INFO] [stderr] error[E0277]: the trait bound `xi_rope::Delta<xi_rope::RopeInfo>: serde::Serialize` is not satisfied
[INFO] [stderr]     --> src/main.rs:291:27
[INFO] [stderr]      |
[INFO] [stderr] 291  |     serde_json::to_string(&d).unwrap().len()
[INFO] [stderr]      |                           ^^ the trait `serde::Serialize` is not implemented for `xi_rope::Delta<xi_rope::RopeInfo>`
[INFO] [stderr]      | 
[INFO] [stderr]     ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_json-1.0.41/src/ser.rs:2224:8
[INFO] [stderr]      |
[INFO] [stderr] 2224 |     T: Serialize,
[INFO] [stderr]      |        --------- required by this bound in `serde_json::to_string`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: could not compile `ropediff`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "828f22c4d1224000ebfe37ddb77e82366a997777d57a21ccaa4f9efd5ff60850"`
[INFO] running `"docker" "rm" "-f" "828f22c4d1224000ebfe37ddb77e82366a997777d57a21ccaa4f9efd5ff60850"`
[INFO] [stdout] 828f22c4d1224000ebfe37ddb77e82366a997777d57a21ccaa4f9efd5ff60850