[INFO] crate basehangul 0.1.10 is already in cache
[INFO] extracting crate basehangul 0.1.10 into work/ex/beta-1.38-1/sources/1.37.0/reg/basehangul/0.1.10
[INFO] extracting crate basehangul 0.1.10 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/basehangul/0.1.10
[INFO] validating manifest of basehangul-0.1.10 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 basehangul-0.1.10 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 basehangul-0.1.10
[INFO] finished frobbing basehangul-0.1.10
[INFO] frobbed toml for basehangul-0.1.10 written to work/ex/beta-1.38-1/sources/1.37.0/reg/basehangul/0.1.10/Cargo.toml
[INFO] started frobbing basehangul-0.1.10
[INFO] finished frobbing basehangul-0.1.10
[INFO] frobbed toml for basehangul-0.1.10 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/basehangul/0.1.10/Cargo.toml
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing basehangul-0.1.10 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/basehangul/0.1.10:/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] 292294f582613a5f306c3cd477155431895c304c794893c7c5ba627920372164
[INFO] running `"docker" "start" "-a" "292294f582613a5f306c3cd477155431895c304c794893c7c5ba627920372164"`
[INFO] [stderr]    Compiling basehangul v0.1.10 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::borrow::IntoCow`
[INFO] [stderr]   --> src/lib.rs:14:24
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::borrow::{Cow, IntoCow};
[INFO] [stderr]    |                        ^^^^^^^ no `IntoCow` in `borrow`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(into_cow)] // lib stability features as per RFC #507
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/lib.rs:250:27
[INFO] [stderr]     |
[INFO] [stderr] 250 |                 Some(b @ 0...1023) => {
[INFO] [stderr]     |                           ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(ellipsis_inclusive_range_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/lib.rs:254:30
[INFO] [stderr]     |
[INFO] [stderr] 254 |                 Some(b @ 1024...2045) => {
[INFO] [stderr]     |                              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `into_cow` found for type `&'static str` in the current scope
[INFO] [stderr]    --> src/lib.rs:243:68
[INFO] [stderr]     |
[INFO] [stderr] 243 |                     return Some(Err("non-integral number of bytes".into_cow()));
[INFO] [stderr]     |                                                                    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `into_cow` found for type `&'static str` in the current scope
[INFO] [stderr]    --> src/lib.rs:271:57
[INFO] [stderr]     |
[INFO] [stderr] 271 |                     return Some(Err("invalid code word".into_cow()));
[INFO] [stderr]     |                                                         ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `basehangul`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "292294f582613a5f306c3cd477155431895c304c794893c7c5ba627920372164"`
[INFO] running `"docker" "rm" "-f" "292294f582613a5f306c3cd477155431895c304c794893c7c5ba627920372164"`
[INFO] [stdout] 292294f582613a5f306c3cd477155431895c304c794893c7c5ba627920372164