[INFO] crate javascript_lexer 0.1.7 is already in cache
[INFO] extracting crate javascript_lexer 0.1.7 into work/ex/beta-1.38-1/sources/1.37.0/reg/javascript_lexer/0.1.7
[INFO] extracting crate javascript_lexer 0.1.7 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/javascript_lexer/0.1.7
[INFO] validating manifest of javascript_lexer-0.1.7 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 javascript_lexer-0.1.7 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 javascript_lexer-0.1.7
[INFO] finished frobbing javascript_lexer-0.1.7
[INFO] frobbed toml for javascript_lexer-0.1.7 written to work/ex/beta-1.38-1/sources/1.37.0/reg/javascript_lexer/0.1.7/Cargo.toml
[INFO] started frobbing javascript_lexer-0.1.7
[INFO] finished frobbing javascript_lexer-0.1.7
[INFO] frobbed toml for javascript_lexer-0.1.7 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/javascript_lexer/0.1.7/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] testing javascript_lexer-0.1.7 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/javascript_lexer/0.1.7:/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] 6e4f33d0980b2b24de25faf4586a182f20d27138457eef7bcc3b461631ae41ff
[INFO] running `"docker" "start" "-a" "6e4f33d0980b2b24de25faf4586a182f20d27138457eef7bcc3b461631ae41ff"`
[INFO] [stderr]    Compiling internship v0.6.0
[INFO] [stderr]    Compiling javascript_lexer v0.1.7 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(const_fn, box_syntax, pattern, proc_macro_hygiene)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/error.rs:9:23
[INFO] [stderr]   |
[INFO] [stderr] 9 |     InternalError(Box<error::Error>),
[INFO] [stderr]   |                       ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `javascript_lexer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6e4f33d0980b2b24de25faf4586a182f20d27138457eef7bcc3b461631ae41ff"`
[INFO] running `"docker" "rm" "-f" "6e4f33d0980b2b24de25faf4586a182f20d27138457eef7bcc3b461631ae41ff"`
[INFO] [stdout] 6e4f33d0980b2b24de25faf4586a182f20d27138457eef7bcc3b461631ae41ff