[INFO] crate syntex_bitflags 0.1.0 is already in cache
[INFO] extracting crate syntex_bitflags 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/syntex_bitflags/0.1.0
[INFO] extracting crate syntex_bitflags 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/syntex_bitflags/0.1.0
[INFO] validating manifest of syntex_bitflags-0.1.0 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 syntex_bitflags-0.1.0 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 syntex_bitflags-0.1.0
[INFO] finished frobbing syntex_bitflags-0.1.0
[INFO] frobbed toml for syntex_bitflags-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/syntex_bitflags/0.1.0/Cargo.toml
[INFO] started frobbing syntex_bitflags-0.1.0
[INFO] finished frobbing syntex_bitflags-0.1.0
[INFO] frobbed toml for syntex_bitflags-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/syntex_bitflags/0.1.0/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 syntex_bitflags-0.1.0 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/syntex_bitflags/0.1.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 0bff6c4f83ad79232983bfadb7636ae6e49483edce45ac3c792394ea2716e93a
[INFO] running `"docker" "start" "-a" "0bff6c4f83ad79232983bfadb7636ae6e49483edce45ac3c792394ea2716e93a"`
[INFO] [stderr]    Compiling syntex_bitflags v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0658]: non-builtin inner attributes are unstable
[INFO] [stderr]   --> src/lib.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![staged_api]
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/54726
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: The attribute `staged_api` is currently unknown to the compiler and may have meaning added to it in the future
[INFO] [stderr]   --> src/lib.rs:12:4
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![staged_api]
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/29642
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]   --> src/lib.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![unstable]
[INFO] [stderr]    | ^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: Could not compile `syntex_bitflags`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0bff6c4f83ad79232983bfadb7636ae6e49483edce45ac3c792394ea2716e93a"`
[INFO] running `"docker" "rm" "-f" "0bff6c4f83ad79232983bfadb7636ae6e49483edce45ac3c792394ea2716e93a"`
[INFO] [stdout] 0bff6c4f83ad79232983bfadb7636ae6e49483edce45ac3c792394ea2716e93a