[INFO] crate pumpkin 2.0.1 is already in cache
[INFO] extracting crate pumpkin 2.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/pumpkin/2.0.1
[INFO] extracting crate pumpkin 2.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pumpkin/2.0.1
[INFO] validating manifest of pumpkin-2.0.1 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 pumpkin-2.0.1 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 pumpkin-2.0.1
[INFO] finished frobbing pumpkin-2.0.1
[INFO] frobbed toml for pumpkin-2.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/pumpkin/2.0.1/Cargo.toml
[INFO] started frobbing pumpkin-2.0.1
[INFO] finished frobbing pumpkin-2.0.1
[INFO] frobbed toml for pumpkin-2.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pumpkin/2.0.1/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 pumpkin-2.0.1 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/pumpkin/2.0.1:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 27ffde35f10559864d0ca21d966814c140cc6a1d46df5bb7d74dc3635cd5886d
[INFO] running `"docker" "start" "-a" "27ffde35f10559864d0ca21d966814c140cc6a1d46df5bb7d74dc3635cd5886d"`
[INFO] [stderr]    Compiling rustc-cfg v0.2.0
[INFO] [stderr]    Compiling hamming v0.1.3
[INFO] [stderr]    Compiling ramp v0.3.13
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/lib.rs:18:1
[INFO] [stderr]    |
[INFO] [stderr] 18 | #![feature(core_intrinsics, asm, allocator_api)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/lib.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![feature(step_trait, ptr_internals, alloc)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 | use alloc::raw_vec::RawVec;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:152:36
[INFO] [stderr]     |
[INFO] [stderr] 152 |     fn with_raw_vec<F: FnOnce(&mut RawVec<Limb>)>(&mut self, f: F) {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:155:27
[INFO] [stderr]     |
[INFO] [stderr] 155 |             let mut vec = RawVec::from_raw_parts(self.ptr.as_mut(), old_cap);
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:939:22
[INFO] [stderr]     |
[INFO] [stderr] 939 |                 drop(RawVec::from_raw_parts(self.ptr.as_mut(),
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:163:40
[INFO] [stderr]     |
[INFO] [stderr] 163 |             self.ptr = Unique::new(vec.ptr()).unwrap();
[INFO] [stderr]     |                                        ^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:164:31
[INFO] [stderr]     |
[INFO] [stderr] 164 |             let new_cap = vec.cap();
[INFO] [stderr]     |                               ^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:186:36
[INFO] [stderr]     |
[INFO] [stderr] 186 |             ret.with_raw_vec(|v| v.reserve_exact(0, cap as usize))
[INFO] [stderr]     |                                    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:275:15
[INFO] [stderr]     |
[INFO] [stderr] 275 |             v.shrink_to_fit(size);
[INFO] [stderr]     |               ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: use of unstable library feature 'raw_vec_internals': implementation detail
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/ramp-0.3.13/src/int.rs:760:19
[INFO] [stderr]     |
[INFO] [stderr] 760 |                 v.reserve_exact(old_cap, cap as usize - old_cap)
[INFO] [stderr]     |                   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 11 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `ramp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "27ffde35f10559864d0ca21d966814c140cc6a1d46df5bb7d74dc3635cd5886d"`
[INFO] running `"docker" "rm" "-f" "27ffde35f10559864d0ca21d966814c140cc6a1d46df5bb7d74dc3635cd5886d"`
[INFO] [stdout] 27ffde35f10559864d0ca21d966814c140cc6a1d46df5bb7d74dc3635cd5886d