[INFO] crate mips 0.2.1 is already in cache
[INFO] extracting crate mips 0.2.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/mips/0.2.1
[INFO] extracting crate mips 0.2.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mips/0.2.1
[INFO] validating manifest of mips-0.2.1 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 mips-0.2.1 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 mips-0.2.1
[INFO] finished frobbing mips-0.2.1
[INFO] frobbed toml for mips-0.2.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/mips/0.2.1/Cargo.toml
[INFO] started frobbing mips-0.2.1
[INFO] finished frobbing mips-0.2.1
[INFO] frobbed toml for mips-0.2.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mips/0.2.1/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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing mips-0.2.1 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mips/0.2.1:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 2d6e4d5a18d17a0dc53b13f9537f5bdcf453848f6f4cb3a44382d18023e993f1
[INFO] running `"docker" "start" "-a" "2d6e4d5a18d17a0dc53b13f9537f5bdcf453848f6f4cb3a44382d18023e993f1"`
[INFO] [stderr]    Compiling mips v0.2.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(asm)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | #![feature(nll)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/interrupts.rs:17:29
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn critical_section(f: &Fn() -> ()) {
[INFO] [stderr]    |                             ^^^^^^^^^^ help: use `dyn`: `dyn Fn() -> ()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `BitField` is imported redundantly
[INFO] [stderr]    --> src/addr.rs:124:13
[INFO] [stderr]     |
[INFO] [stderr] 3   | use bit_field::BitField;
[INFO] [stderr]     |     ------------------- the item `BitField` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 124 |         use bit_field::BitField;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[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 `mips`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2d6e4d5a18d17a0dc53b13f9537f5bdcf453848f6f4cb3a44382d18023e993f1"`
[INFO] running `"docker" "rm" "-f" "2d6e4d5a18d17a0dc53b13f9537f5bdcf453848f6f4cb3a44382d18023e993f1"`
[INFO] [stdout] 2d6e4d5a18d17a0dc53b13f9537f5bdcf453848f6f4cb3a44382d18023e993f1