[INFO] updating cached repository Leo2807/word_count
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Leo2807/word_count
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Leo2807/word_count" "work/ex/beta-1.38-1/sources/1.37.0/gh/Leo2807/word_count"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Leo2807/word_count'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Leo2807/word_count" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Leo2807/word_count"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Leo2807/word_count'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ec71d65588b4e45bd2251a189b62d7c80bb640aa
[INFO] sha for GitHub repo Leo2807/word_count: ec71d65588b4e45bd2251a189b62d7c80bb640aa
[INFO] validating manifest of Leo2807/word_count 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 Leo2807/word_count 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 Leo2807/word_count
[INFO] finished frobbing Leo2807/word_count
[INFO] frobbed toml for Leo2807/word_count written to work/ex/beta-1.38-1/sources/1.37.0/gh/Leo2807/word_count/Cargo.toml
[INFO] started frobbing Leo2807/word_count
[INFO] finished frobbing Leo2807/word_count
[INFO] frobbed toml for Leo2807/word_count written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Leo2807/word_count/Cargo.toml
[INFO] crate Leo2807/word_count already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Leo2807/word_count/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[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 Leo2807/word_count 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Leo2807/word_count:/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] 675842b619670669618d3e3aa309993150a3be610402578e91be2425b0f9a95f
[INFO] running `"docker" "start" "-a" "675842b619670669618d3e3aa309993150a3be610402578e91be2425b0f9a95f"`
[INFO] [stderr]    Compiling word_count v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(collections)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]   --> src/pivot_sort.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     #[stable]
[INFO] [stderr]    |     ^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]   --> src/pivot_sort.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]   --> src/pivot_sort.rs:91:1
[INFO] [stderr]    |
[INFO] [stderr] 91 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]  --> src/pivot_sort.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![stable]
[INFO] [stderr]   | ^^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]   --> src/word_index.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]   --> src/word_index.rs:68:1
[INFO] [stderr]    |
[INFO] [stderr] 68 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `stable` attribute input
[INFO] [stderr]  --> src/word_index.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![stable]
[INFO] [stderr]   | ^^^^^^^^^^ help: must be of the form: `#[stable(feature = "name", since = "version")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]   --> src/lib.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: malformed `unstable` attribute input
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![unstable]
[INFO] [stderr]   | ^^^^^^^^^^^^ help: must be of the form: `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![unstable]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]  --> src/pivot_sort.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![stable]
[INFO] [stderr]   | ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/pivot_sort.rs:34:1
[INFO] [stderr]    |
[INFO] [stderr] 34 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/pivot_sort.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     #[stable]
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/pivot_sort.rs:91:1
[INFO] [stderr]    |
[INFO] [stderr] 91 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]  --> src/word_index.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![stable]
[INFO] [stderr]   | ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/word_index.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/word_index.rs:68:1
[INFO] [stderr]    |
[INFO] [stderr] 68 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> src/lib.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 19 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `word_count`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "675842b619670669618d3e3aa309993150a3be610402578e91be2425b0f9a95f"`
[INFO] running `"docker" "rm" "-f" "675842b619670669618d3e3aa309993150a3be610402578e91be2425b0f9a95f"`
[INFO] [stdout] 675842b619670669618d3e3aa309993150a3be610402578e91be2425b0f9a95f