[INFO] crate drone-cortex-m-macros 0.7.0 is already in cache
[INFO] extracting crate drone-cortex-m-macros 0.7.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/drone-cortex-m-macros/0.7.0
[INFO] extracting crate drone-cortex-m-macros 0.7.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/drone-cortex-m-macros/0.7.0
[INFO] validating manifest of drone-cortex-m-macros-0.7.0 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 drone-cortex-m-macros-0.7.0 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 drone-cortex-m-macros-0.7.0
[INFO] finished frobbing drone-cortex-m-macros-0.7.0
[INFO] frobbed toml for drone-cortex-m-macros-0.7.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/drone-cortex-m-macros/0.7.0/Cargo.toml
[INFO] started frobbing drone-cortex-m-macros-0.7.0
[INFO] finished frobbing drone-cortex-m-macros-0.7.0
[INFO] frobbed toml for drone-cortex-m-macros-0.7.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/drone-cortex-m-macros/0.7.0/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing drone-cortex-m-macros-0.7.0 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/drone-cortex-m-macros/0.7.0:/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] 4c05f5585f8e2d7efd48f1ef21b9bbd5ea66a5545c9af321f9d7e2b84280a891
[INFO] running `"docker" "start" "-a" "4c05f5585f8e2d7efd48f1ef21b9bbd5ea66a5545c9af321f9d7e2b84280a891"`
[INFO] [stderr]    Compiling drone-cortex-m-macros v0.7.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(proc_macro)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'failure::core::str::<impl str>::trim_left_matches': superseded by `trim_start_matches`
[INFO] [stderr]   --> src/vtable.rs:31:31
[INFO] [stderr]    |
[INFO] [stderr] 31 |           let string = string.trim_left_matches("///");
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated item: `trim_start_matches`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[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-cortex-m-macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "4c05f5585f8e2d7efd48f1ef21b9bbd5ea66a5545c9af321f9d7e2b84280a891"`
[INFO] running `"docker" "rm" "-f" "4c05f5585f8e2d7efd48f1ef21b9bbd5ea66a5545c9af321f9d7e2b84280a891"`
[INFO] [stdout] 4c05f5585f8e2d7efd48f1ef21b9bbd5ea66a5545c9af321f9d7e2b84280a891