[INFO] crate lru-cache-macros 0.3.1 is already in cache
[INFO] extracting crate lru-cache-macros 0.3.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/lru-cache-macros/0.3.1
[INFO] extracting crate lru-cache-macros 0.3.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/lru-cache-macros/0.3.1
[INFO] validating manifest of lru-cache-macros-0.3.1 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 lru-cache-macros-0.3.1 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 lru-cache-macros-0.3.1
[INFO] finished frobbing lru-cache-macros-0.3.1
[INFO] frobbed toml for lru-cache-macros-0.3.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/lru-cache-macros/0.3.1/Cargo.toml
[INFO] started frobbing lru-cache-macros-0.3.1
[INFO] finished frobbing lru-cache-macros-0.3.1
[INFO] frobbed toml for lru-cache-macros-0.3.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/lru-cache-macros/0.3.1/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 lru-cache-macros-0.3.1 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/lru-cache-macros/0.3.1:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 7d73cb91ed82592cc018003570a26a0d245d50f114688270fb8ee1ac82cfd481
[INFO] running `"docker" "start" "-a" "7d73cb91ed82592cc018003570a26a0d245d50f114688270fb8ee1ac82cfd481"`
[INFO] [stderr]    Compiling lru-cache-macros v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:178:1
[INFO] [stderr]     |
[INFO] [stderr] 178 | #![feature(extern_crate_item_prelude)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:179:1
[INFO] [stderr]     |
[INFO] [stderr] 179 | #![feature(proc_macro_diagnostic)]
[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 `lru-cache-macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7d73cb91ed82592cc018003570a26a0d245d50f114688270fb8ee1ac82cfd481"`
[INFO] running `"docker" "rm" "-f" "7d73cb91ed82592cc018003570a26a0d245d50f114688270fb8ee1ac82cfd481"`
[INFO] [stdout] 7d73cb91ed82592cc018003570a26a0d245d50f114688270fb8ee1ac82cfd481