[INFO] crate rustdoc-highlight 0.1.7 is already in cache
[INFO] extracting crate rustdoc-highlight 0.1.7 into work/ex/beta-1.37-6/sources/1.36.0/reg/rustdoc-highlight/0.1.7
[INFO] extracting crate rustdoc-highlight 0.1.7 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rustdoc-highlight/0.1.7
[INFO] validating manifest of rustdoc-highlight-0.1.7 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 rustdoc-highlight-0.1.7 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 rustdoc-highlight-0.1.7
[INFO] finished frobbing rustdoc-highlight-0.1.7
[INFO] frobbed toml for rustdoc-highlight-0.1.7 written to work/ex/beta-1.37-6/sources/1.36.0/reg/rustdoc-highlight/0.1.7/Cargo.toml
[INFO] started frobbing rustdoc-highlight-0.1.7
[INFO] finished frobbing rustdoc-highlight-0.1.7
[INFO] frobbed toml for rustdoc-highlight-0.1.7 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rustdoc-highlight/0.1.7/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 rustdoc-highlight-0.1.7 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-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/rustdoc-highlight/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] e97579e06f4c832bc20bde5933cbd6c38a206935e96c986b2c3be86f37a338a7
[INFO] running `"docker" "start" "-a" "e97579e06f4c832bc20bde5933cbd6c38a206935e96c986b2c3be86f37a338a7"`
[INFO] [stderr]    Compiling rustdoc-highlight 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:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![feature(rustc_private)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no function or associated item named `new` found for type `syntax::parse::lexer::StringReader<'_>` in the current scope
[INFO] [stderr]   --> src/lib.rs:56:63
[INFO] [stderr]    |
[INFO] [stderr] 56 |     let mut classifier = Classifier::new(lexer::StringReader::new(&sess, fm, None), sess.source_map());
[INFO] [stderr]    |                                                               ^^^ function or associated item not found in `syntax::parse::lexer::StringReader<'_>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no function or associated item named `new` found for type `syntax::parse::lexer::StringReader<'_>` in the current scope
[INFO] [stderr]   --> src/lib.rs:76:63
[INFO] [stderr]    |
[INFO] [stderr] 76 |     let mut classifier = Classifier::new(lexer::StringReader::new(&sess, fm, None), sess.source_map());
[INFO] [stderr]    |                                                               ^^^ function or associated item not found in `syntax::parse::lexer::StringReader<'_>`
[INFO] [stderr] 
[INFO] [stderr] error[E0624]: method `emit_fatal_errors` is private
[INFO] [stderr]    --> src/lib.rs:200:32
[INFO] [stderr]     |
[INFO] [stderr] 200 |                     self.lexer.emit_fatal_errors();
[INFO] [stderr]     |                                ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0616]: field `sess` of struct `syntax::parse::lexer::StringReader` is private
[INFO] [stderr]    --> src/lib.rs:201:21
[INFO] [stderr]     |
[INFO] [stderr] 201 |                     self.lexer.sess.span_diagnostic
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599, E0616, E0624.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rustdoc-highlight`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e97579e06f4c832bc20bde5933cbd6c38a206935e96c986b2c3be86f37a338a7"`
[INFO] running `"docker" "rm" "-f" "e97579e06f4c832bc20bde5933cbd6c38a206935e96c986b2c3be86f37a338a7"`
[INFO] [stdout] e97579e06f4c832bc20bde5933cbd6c38a206935e96c986b2c3be86f37a338a7