[INFO] updating cached repository Ploppz/experiment
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Ploppz/experiment
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Ploppz/experiment" "work/ex/beta-1.38-1/sources/1.37.0/gh/Ploppz/experiment"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Ploppz/experiment'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Ploppz/experiment" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Ploppz/experiment"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Ploppz/experiment'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ff9ee74fc6fb5580006b5a0719bb5cc6849c3fd1
[INFO] sha for GitHub repo Ploppz/experiment: ff9ee74fc6fb5580006b5a0719bb5cc6849c3fd1
[INFO] validating manifest of Ploppz/experiment 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 Ploppz/experiment 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 Ploppz/experiment
[INFO] removed path dependency plotlib from Ploppz/experiment
[INFO] finished frobbing Ploppz/experiment
[INFO] frobbed toml for Ploppz/experiment written to work/ex/beta-1.38-1/sources/1.37.0/gh/Ploppz/experiment/Cargo.toml
[INFO] started frobbing Ploppz/experiment
[INFO] removed path dependency plotlib from Ploppz/experiment
[INFO] finished frobbing Ploppz/experiment
[INFO] frobbed toml for Ploppz/experiment written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Ploppz/experiment/Cargo.toml
[INFO] crate Ploppz/experiment 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/Ploppz/experiment/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[INFO] the lockfile is outdated, regenerating it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 Ploppz/experiment against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Ploppz/experiment:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 9ac1b8e63771560e90f93f20a7bed771e475f9fecb1a014d515eb384a7f95944
[INFO] running `"docker" "start" "-a" "9ac1b8e63771560e90f93f20a7bed771e475f9fecb1a014d515eb384a7f95944"`
[INFO] [stderr] warning: dependency (plotlib) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling svg v0.5.12
[INFO] [stderr]    Compiling half v1.3.0
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling serde_cbor v0.9.0
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling plotlib v0.4.0
[INFO] [stderr]    Compiling ndarray v0.12.1
[INFO] [stderr]    Compiling experiment v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `plotlib::repr`
[INFO] [stderr]  --> src/lib.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     repr,
[INFO] [stderr]   |     ^^^^ no `repr` in the root
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Deserialize`
[INFO] [stderr]  --> src/lib.rs:2:46
[INFO] [stderr]   |
[INFO] [stderr] 2 | use serde::{Serialize, de::DeserializeOwned, Deserialize};
[INFO] [stderr]   |                                              ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `bail`, `format_err`
[INFO] [stderr]  --> src/lib.rs:5:15
[INFO] [stderr]   |
[INFO] [stderr] 5 | use failure::{bail, format_err};
[INFO] [stderr]   |               ^^^^  ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Array1`, `Array2`
[INFO] [stderr]  --> src/lib.rs:6:15
[INFO] [stderr]   |
[INFO] [stderr] 6 | use ndarray::{Array1, Array2};
[INFO] [stderr]   |               ^^^^^^  ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `style::*`, `view::ContinuousView`
[INFO] [stderr]   --> src/lib.rs:9:5
[INFO] [stderr]    |
[INFO] [stderr] 9  |     style::*,
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 10 |     view::ContinuousView,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `experiment`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9ac1b8e63771560e90f93f20a7bed771e475f9fecb1a014d515eb384a7f95944"`
[INFO] running `"docker" "rm" "-f" "9ac1b8e63771560e90f93f20a7bed771e475f9fecb1a014d515eb384a7f95944"`
[INFO] [stdout] 9ac1b8e63771560e90f93f20a7bed771e475f9fecb1a014d515eb384a7f95944