[INFO] crate drone-fatfs-sd 0.2.3 is already in cache
[INFO] extracting crate drone-fatfs-sd 0.2.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/drone-fatfs-sd/0.2.3
[INFO] extracting crate drone-fatfs-sd 0.2.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/drone-fatfs-sd/0.2.3
[INFO] validating manifest of drone-fatfs-sd-0.2.3 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 drone-fatfs-sd-0.2.3 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 drone-fatfs-sd-0.2.3
[INFO] finished frobbing drone-fatfs-sd-0.2.3
[INFO] frobbed toml for drone-fatfs-sd-0.2.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/drone-fatfs-sd/0.2.3/Cargo.toml
[INFO] started frobbing drone-fatfs-sd-0.2.3
[INFO] finished frobbing drone-fatfs-sd-0.2.3
[INFO] frobbed toml for drone-fatfs-sd-0.2.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/drone-fatfs-sd/0.2.3/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 drone-fatfs-sd-0.2.3 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/drone-fatfs-sd/0.2.3:/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] 665701de3a28a6a5994b9de74b1bf72cd4fc95987ce0428ad481e9593142c161
[INFO] running `"docker" "start" "-a" "665701de3a28a6a5994b9de74b1bf72cd4fc95987ce0428ad481e9593142c161"`
[INFO] [stderr]    Compiling futures-core-preview v0.2.3
[INFO] [stderr]    Compiling bindgen v0.37.4
[INFO] [stderr]    Compiling if_chain v0.1.3
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling drone-ctypes v0.8.3
[INFO] [stderr]    Compiling clang-sys v0.23.0
[INFO] [stderr]    Compiling proc-macro2 v0.3.5
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]    Compiling futures-channel-preview v0.2.2
[INFO] [stderr]    Compiling futures-io-preview v0.2.2
[INFO] [stderr]    Compiling futures-sink-preview v0.2.2
[INFO] [stderr]    Compiling futures-util-preview v0.2.2
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling futures-executor-preview v0.2.2
[INFO] [stderr]    Compiling futures-stable-preview v0.2.3
[INFO] [stderr]    Compiling futures-async-runtime-preview v0.2.3
[INFO] [stderr]    Compiling futures-preview v0.2.2
[INFO] [stderr]    Compiling drone-macros-core v0.8.3
[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/drone-macros-core-0.8.3/src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(proc_macro_diagnostic)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `drone-macros-core`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "665701de3a28a6a5994b9de74b1bf72cd4fc95987ce0428ad481e9593142c161"`
[INFO] running `"docker" "rm" "-f" "665701de3a28a6a5994b9de74b1bf72cd4fc95987ce0428ad481e9593142c161"`
[INFO] [stdout] 665701de3a28a6a5994b9de74b1bf72cd4fc95987ce0428ad481e9593142c161