[INFO] updating cached repository zmpeg/learning_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/zmpeg/learning_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/zmpeg/learning_rust" "work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/zmpeg/learning_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/zmpeg/learning_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/zmpeg/learning_rust" "work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/zmpeg/learning_rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/zmpeg/learning_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9453401d644e178ab487422ee4feb983fd97e844
[INFO] sha for GitHub repo zmpeg/learning_rust: 9453401d644e178ab487422ee4feb983fd97e844
[INFO] validating manifest of zmpeg/learning_rust on toolchain master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of zmpeg/learning_rust on toolchain try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing zmpeg/learning_rust
[INFO] finished frobbing zmpeg/learning_rust
[INFO] frobbed toml for zmpeg/learning_rust written to work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/zmpeg/learning_rust/Cargo.toml
[INFO] started frobbing zmpeg/learning_rust
[INFO] finished frobbing zmpeg/learning_rust
[INFO] frobbed toml for zmpeg/learning_rust written to work/ex/pr-59199/sources/try#68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b/gh/zmpeg/learning_rust/Cargo.toml
[INFO] crate zmpeg/learning_rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/crater-raid/crater/work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/zmpeg/learning_rust/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fern_macros v0.1.8
[INFO] [stderr]   Downloaded fern v0.1.12
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+68fcf881bd1e4dbfc21e22f8c7a56b8a5d8e8f7b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking zmpeg/learning_rust against master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7 for pr-59199
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-59199/worker-3/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-59199/sources/master#bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7/gh/zmpeg/learning_rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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=forbid" "-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" "+bc44841ad2a2ad5f6c5e67b9e35ed8e7e71d4dc7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 20f75fd427ce6e02c23562a73aec16ecc1501a689148c5f4bfe2b9f659c3f7af
[INFO] running `"docker" "start" "-a" "20f75fd427ce6e02c23562a73aec16ecc1501a689148c5f4bfe2b9f659c3f7af"`
[INFO] [stderr]     Checking fern v0.1.12
[INFO] [stderr] error[E0432]: unresolved import `std::old_io`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::old_io as io;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^ no `old_io` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::old_io`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:2:10
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::old_io::stdio;
[INFO] [stderr]   |          ^^^^^^ could not find `old_io` in `std`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::old_io`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/loggers.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::old_io as io;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^ no `old_io` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::old_io`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/loggers.rs:2:10
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::old_io::stdio;
[INFO] [stderr]   |          ^^^^^^ could not find `old_io` in `std`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::old_io`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/errors.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::old_io as io;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^ no `old_io` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `Path` in this scope
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:35:10
[INFO] [stderr]    |
[INFO] [stderr] 35 |     File(Path),
[INFO] [stderr]    |          ^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]    |
[INFO] [stderr] 1  | use std::path::Path;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error[E0412]: cannot find type `Path` in this scope
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/loggers.rs:76:29
[INFO] [stderr]    |
[INFO] [stderr] 76 |     pub fn with_file(path: &Path) -> io::IoResult<WriterLogger<io::File>> {
[INFO] [stderr]    |                             ^^^^ not found in this scope
[INFO] [stderr] help: possible candidate is found in another module, you can import it into scope
[INFO] [stderr]    |
[INFO] [stderr] 1  | use std::path::Path;
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error[E0405]: cannot find trait `FromError` in module `error`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/errors.rs:11:13
[INFO] [stderr]    |
[INFO] [stderr] 11 | impl error::FromError<io::IoError> for Error {
[INFO] [stderr]    |             ^^^^^^^^^ not found in `error`
[INFO] [stderr] 
[INFO] [stderr] error[E0405]: cannot find trait `FromError` in module `error`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/errors.rs:17:17
[INFO] [stderr]    |
[INFO] [stderr] 17 | impl <T> error::FromError<sync::PoisonError<T>> for Error {
[INFO] [stderr]    |                 ^^^^^^^^^ not found in `error`
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/local.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/local.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/lib.rs:137:1
[INFO] [stderr]     |
[INFO] [stderr] 137 | #[unstable]
[INFO] [stderr]     | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #[unstable]
[INFO] [stderr]   | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[stable(feature = "name", since = "version")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:42:1
[INFO] [stderr]    |
[INFO] [stderr] 42 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:58:1
[INFO] [stderr]    |
[INFO] [stderr] 58 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:72:5
[INFO] [stderr]    |
[INFO] [stderr] 72 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:68:1
[INFO] [stderr]    |
[INFO] [stderr] 68 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: attribute must be of the form `#[unstable(feature = "name", reason = "...", issue = "N")]`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/loggers.rs:90:1
[INFO] [stderr]    |
[INFO] [stderr] 90 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/lib.rs:137:1
[INFO] [stderr]     |
[INFO] [stderr] 137 | #[unstable]
[INFO] [stderr]     | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/local.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/local.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #[unstable]
[INFO] [stderr]   | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:39:1
[INFO] [stderr]    |
[INFO] [stderr] 39 | #[stable]
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:42:1
[INFO] [stderr]    |
[INFO] [stderr] 42 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/api.rs:58:1
[INFO] [stderr]    |
[INFO] [stderr] 58 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:68:1
[INFO] [stderr]    |
[INFO] [stderr] 68 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/config.rs:72:5
[INFO] [stderr]    |
[INFO] [stderr] 72 |     #[unstable]
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: stability attributes may not be used outside of the standard library
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/fern-0.1.12/src/loggers.rs:90:1
[INFO] [stderr]    |
[INFO] [stderr] 90 | #[unstable]
[INFO] [stderr]    | ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 57 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors occurred: E0405, E0412, E0432.
[INFO] [stderr] For more information about an error, try `rustc --explain E0405`.
[INFO] [stderr] error: Could not compile `fern`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "20f75fd427ce6e02c23562a73aec16ecc1501a689148c5f4bfe2b9f659c3f7af"`
[INFO] running `"docker" "rm" "-f" "20f75fd427ce6e02c23562a73aec16ecc1501a689148c5f4bfe2b9f659c3f7af"`
[INFO] [stdout] 20f75fd427ce6e02c23562a73aec16ecc1501a689148c5f4bfe2b9f659c3f7af