[INFO] crate mutagen 0.1.2 is already in cache
[INFO] extracting crate mutagen 0.1.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/mutagen/0.1.2
[INFO] extracting crate mutagen 0.1.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mutagen/0.1.2
[INFO] validating manifest of mutagen-0.1.2 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 mutagen-0.1.2 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 mutagen-0.1.2
[INFO] finished frobbing mutagen-0.1.2
[INFO] frobbed toml for mutagen-0.1.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/mutagen/0.1.2/Cargo.toml
[INFO] started frobbing mutagen-0.1.2
[INFO] finished frobbing mutagen-0.1.2
[INFO] frobbed toml for mutagen-0.1.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mutagen/0.1.2/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 mutagen-0.1.2 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/mutagen/0.1.2:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b653c04fe0ae5a231bb1248b937cbed730a8a1f755beea5c36394e89a1420bc8
[INFO] running `"docker" "start" "-a" "b653c04fe0ae5a231bb1248b937cbed730a8a1f755beea5c36394e89a1420bc8"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling mutagen v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> build.rs:6:26
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn write_binop(out: &mut Write, o_trait: &str, o_fn: &str, mut_trait: &str, mut_fn: &str) ->
[INFO] [stderr]   |                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> build.rs:68:25
[INFO] [stderr]    |
[INFO] [stderr] 68 | fn write_unop(out: &mut Write, op_trait: &str, op_fn: &str) -> Result<()> {
[INFO] [stderr]    |                         ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(specialization, atomic_min_max, try_from, assoc_unix_epoch)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:143:72
[INFO] [stderr]     |
[INFO] [stderr] 143 |     pub fn forloop<'a, I: Iterator + 'a>(&self, i: I, n: usize) -> Box<Iterator<Item=I::Item> + 'a> {
[INFO] [stderr]     |                                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=I::Item> + 'a`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:216:94
[INFO] [stderr]     |
[INFO] [stderr] 216 | pub fn forloop<'a, I: Iterator + 'a>(i: I, n: usize, flag: &AtomicUsize, mask: usize) -> Box<Iterator<Item=I::Item > + 'a> {
[INFO] [stderr]     |                                                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item=I::Item > + 'a`
[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 `mutagen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b653c04fe0ae5a231bb1248b937cbed730a8a1f755beea5c36394e89a1420bc8"`
[INFO] running `"docker" "rm" "-f" "b653c04fe0ae5a231bb1248b937cbed730a8a1f755beea5c36394e89a1420bc8"`
[INFO] [stdout] b653c04fe0ae5a231bb1248b937cbed730a8a1f755beea5c36394e89a1420bc8