[INFO] fetching crate rustc-ap-syntax 539.0.0...
[INFO] extracting crate rustc-ap-syntax 539.0.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/rustc-ap-syntax/539.0.0
[INFO] extracting crate rustc-ap-syntax 539.0.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rustc-ap-syntax/539.0.0
[INFO] validating manifest of rustc-ap-syntax-539.0.0 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 rustc-ap-syntax-539.0.0 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 rustc-ap-syntax-539.0.0
[INFO] finished frobbing rustc-ap-syntax-539.0.0
[INFO] frobbed toml for rustc-ap-syntax-539.0.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/rustc-ap-syntax/539.0.0/Cargo.toml
[INFO] started frobbing rustc-ap-syntax-539.0.0
[INFO] finished frobbing rustc-ap-syntax-539.0.0
[INFO] frobbed toml for rustc-ap-syntax-539.0.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rustc-ap-syntax/539.0.0/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] [stderr]     Blocking waiting for file lock on package cache lock
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-ap-rustc_target v539.0.0
[INFO] [stderr]   Downloaded rustc-ap-syntax_pos v539.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_errors v539.0.0
[INFO] [stderr]   Downloaded rustc-ap-rustc_lexer v539.0.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rustc-ap-syntax-539.0.0 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-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/rustc-ap-syntax/539.0.0:/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] 7ef21e4c66c98d7f1df92c2acdd43b7275cede35869c3b556200f403668e1712
[INFO] running `"docker" "start" "-a" "7ef21e4c66c98d7f1df92c2acdd43b7275cede35869c3b556200f403668e1712"`
[INFO] [stderr]    Compiling rustc-rayon-core v0.2.0
[INFO] [stderr]    Compiling smallvec v0.6.10
[INFO] [stderr]    Compiling rustc-rayon v0.2.0
[INFO] [stderr]    Compiling rustc-ap-graphviz v539.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_target v539.0.0
[INFO] [stderr]    Compiling annotate-snippets v0.5.0
[INFO] [stderr]    Compiling rustc-ap-syntax v539.0.0 (/opt/crater/workdir)
[INFO] [stderr]    Compiling rustc-ap-rustc_lexer v539.0.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-graphviz-539.0.0/lib.rs:279:1
[INFO] [stderr]     |
[INFO] [stderr] 279 | #![feature(rustc_private, nll)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-rustc_lexer-539.0.0/src/lib.rs:3:43
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![cfg_attr(not(feature = "unicode-xid"), feature(unicode_internals))]
[INFO] [stderr]   |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] error[E0658]: use of unstable library feature 'rustc_private': mainly needed for compiler internals
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-rustc_lexer-539.0.0/src/lib.rs:689:33
[INFO] [stderr]     |
[INFO] [stderr] 689 |             || (c > '\x7f' && 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]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-rustc_lexer-539.0.0/src/lib.rs:708:33
[INFO] [stderr]     |
[INFO] [stderr] 708 |             || (c > '\x7f' && 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] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `rustc-ap-graphviz`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 3 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 `rustc-ap-rustc_lexer`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.10/lib.rs:33:32
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![cfg_attr(feature = "union", feature(untagged_unions))]
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.10/lib.rs:35:37
[INFO] [stderr]    |
[INFO] [stderr] 35 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `smallvec`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "7ef21e4c66c98d7f1df92c2acdd43b7275cede35869c3b556200f403668e1712"`
[INFO] running `"docker" "rm" "-f" "7ef21e4c66c98d7f1df92c2acdd43b7275cede35869c3b556200f403668e1712"`
[INFO] [stdout] 7ef21e4c66c98d7f1df92c2acdd43b7275cede35869c3b556200f403668e1712