[INFO] crate malk-lexer 0.1.1 is already in cache
[INFO] extracting crate malk-lexer 0.1.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/malk-lexer/0.1.1
[INFO] extracting crate malk-lexer 0.1.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/malk-lexer/0.1.1
[INFO] validating manifest of malk-lexer-0.1.1 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of malk-lexer-0.1.1 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing malk-lexer-0.1.1
[INFO] finished frobbing malk-lexer-0.1.1
[INFO] frobbed toml for malk-lexer-0.1.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/malk-lexer/0.1.1/Cargo.toml
[INFO] started frobbing malk-lexer-0.1.1
[INFO] finished frobbing malk-lexer-0.1.1
[INFO] frobbed toml for malk-lexer-0.1.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/malk-lexer/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing malk-lexer-0.1.1 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/malk-lexer/0.1.1:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 86a71a8e32e4d7c5e0c7cc08f44b1d80fc88060d7f1cf54eb0f4d3e7dbffbecc
[INFO] running `"docker" "start" "-a" "86a71a8e32e4d7c5e0c7cc08f44b1d80fc88060d7f1cf54eb0f4d3e7dbffbecc"`
[INFO] [stderr]    Compiling unicode-brackets v0.1.1
[INFO] [stderr]    Compiling malk-lexer v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(pattern)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(unicode)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': mainly needed for compiler internals
[INFO] [stderr]    --> src/lex.rs:163:14
[INFO] [stderr]     |
[INFO] [stderr] 163 |         if c.is_xid_start() {
[INFO] [stderr]     |              ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': mainly needed for compiler internals
[INFO] [stderr]    --> src/lex.rs:170:23
[INFO] [stderr]     |
[INFO] [stderr] 170 |                 if !c.is_xid_continue() {
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': mainly needed for compiler internals
[INFO] [stderr]    --> src/lex.rs:370:26
[INFO] [stderr]     |
[INFO] [stderr] 370 |                        c.is_xid_start() ||
[INFO] [stderr]     |                          ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: for more information, see https://github.com/rust-lang/rust/issues/27812
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `malk-lexer`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "86a71a8e32e4d7c5e0c7cc08f44b1d80fc88060d7f1cf54eb0f4d3e7dbffbecc"`
[INFO] running `"docker" "rm" "-f" "86a71a8e32e4d7c5e0c7cc08f44b1d80fc88060d7f1cf54eb0f4d3e7dbffbecc"`
[INFO] [stdout] 86a71a8e32e4d7c5e0c7cc08f44b1d80fc88060d7f1cf54eb0f4d3e7dbffbecc