[INFO] updating cached repository arthurprs/rust-optimized-inttostr
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/arthurprs/rust-optimized-inttostr
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/arthurprs/rust-optimized-inttostr" "work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/rust-optimized-inttostr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/rust-optimized-inttostr'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arthurprs/rust-optimized-inttostr" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arthurprs/rust-optimized-inttostr"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arthurprs/rust-optimized-inttostr'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 56400b3908436b4b630da47ec66738a266d39fef
[INFO] sha for GitHub repo arthurprs/rust-optimized-inttostr: 56400b3908436b4b630da47ec66738a266d39fef
[INFO] validating manifest of arthurprs/rust-optimized-inttostr 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 arthurprs/rust-optimized-inttostr 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 arthurprs/rust-optimized-inttostr
[INFO] finished frobbing arthurprs/rust-optimized-inttostr
[INFO] frobbed toml for arthurprs/rust-optimized-inttostr written to work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/rust-optimized-inttostr/Cargo.toml
[INFO] started frobbing arthurprs/rust-optimized-inttostr
[INFO] finished frobbing arthurprs/rust-optimized-inttostr
[INFO] frobbed toml for arthurprs/rust-optimized-inttostr written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arthurprs/rust-optimized-inttostr/Cargo.toml
[INFO] crate arthurprs/rust-optimized-inttostr 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] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/arthurprs/rust-optimized-inttostr/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 arthurprs/rust-optimized-inttostr 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-6/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/arthurprs/rust-optimized-inttostr:/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] 28827ebd7fa66d19f925458f0024a72e8eb02a0d43ab889c7c6b8d44e7ffc685
[INFO] running `"docker" "start" "-a" "28827ebd7fa66d19f925458f0024a72e8eb02a0d43ab889c7c6b8d44e7ffc685"`
[INFO] [stderr]    Compiling int v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(custom_derive)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] note: subsumed by `#[proc_macro_derive]`
[INFO] [stderr]  --> src/main.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(custom_derive)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `rand::StdRng`
[INFO] [stderr]   --> src/main.rs:11:31
[INFO] [stderr]    |
[INFO] [stderr] 11 |     use rand::{Rng, SeedableRng, StdRng};
[INFO] [stderr]    |                                  ^^^^^^ no `StdRng` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(custom_derive)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::num::Wrapping`
[INFO] [stderr]  --> src/wrapper.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::num::Wrapping;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]   --> src/main.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 |     use rand::{Rng, SeedableRng, StdRng};
[INFO] [stderr]    |                ^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554, E0557.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `int`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "28827ebd7fa66d19f925458f0024a72e8eb02a0d43ab889c7c6b8d44e7ffc685"`
[INFO] running `"docker" "rm" "-f" "28827ebd7fa66d19f925458f0024a72e8eb02a0d43ab889c7c6b8d44e7ffc685"`
[INFO] [stdout] 28827ebd7fa66d19f925458f0024a72e8eb02a0d43ab889c7c6b8d44e7ffc685