[INFO] updating cached repository cmyr/ropediff
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cmyr/ropediff
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cmyr/ropediff" "work/ex/beta-1.38-1/sources/1.37.0/gh/cmyr/ropediff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cmyr/ropediff'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cmyr/ropediff" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cmyr/ropediff"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cmyr/ropediff'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e17b2dd8b095eeabf36a5514be99737c3cb9069a
[INFO] sha for GitHub repo cmyr/ropediff: e17b2dd8b095eeabf36a5514be99737c3cb9069a
[INFO] validating manifest of cmyr/ropediff on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cmyr/ropediff on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cmyr/ropediff
[INFO] removed path dependency xi-rope from cmyr/ropediff
[INFO] finished frobbing cmyr/ropediff
[INFO] frobbed toml for cmyr/ropediff written to work/ex/beta-1.38-1/sources/1.37.0/gh/cmyr/ropediff/Cargo.toml
[INFO] started frobbing cmyr/ropediff
[INFO] removed path dependency xi-rope from cmyr/ropediff
[INFO] finished frobbing cmyr/ropediff
[INFO] frobbed toml for cmyr/ropediff written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cmyr/ropediff/Cargo.toml
[INFO] crate cmyr/ropediff already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/cmyr/ropediff/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing cmyr/ropediff against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cmyr/ropediff:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 2b81691d46b5ea4fe82cff673a08c277a7d7fa9f57ccb4f93f4050eea8697887
[INFO] running `"docker" "start" "-a" "2b81691d46b5ea4fe82cff673a08c277a7d7fa9f57ccb4f93f4050eea8697887"`
[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/crater/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:266:17
[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]     = note: required by `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:291:5
[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]     = note: required by `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" "2b81691d46b5ea4fe82cff673a08c277a7d7fa9f57ccb4f93f4050eea8697887"`
[INFO] running `"docker" "rm" "-f" "2b81691d46b5ea4fe82cff673a08c277a7d7fa9f57ccb4f93f4050eea8697887"`
[INFO] [stdout] 2b81691d46b5ea4fe82cff673a08c277a7d7fa9f57ccb4f93f4050eea8697887