[INFO] crate gap_vec 0.1.0 is already in cache
[INFO] extracting crate gap_vec 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/gap_vec/0.1.0
[INFO] extracting crate gap_vec 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gap_vec/0.1.0
[INFO] validating manifest of gap_vec-0.1.0 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 gap_vec-0.1.0 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 gap_vec-0.1.0
[INFO] finished frobbing gap_vec-0.1.0
[INFO] frobbed toml for gap_vec-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/gap_vec/0.1.0/Cargo.toml
[INFO] started frobbing gap_vec-0.1.0
[INFO] finished frobbing gap_vec-0.1.0
[INFO] frobbed toml for gap_vec-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gap_vec/0.1.0/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing gap_vec-0.1.0 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-6/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/gap_vec/0.1.0:/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] 1efe71f94613316bd40795a02d2c643bafa2120cb28728d3a08bfef48a736a5d
[INFO] running `"docker" "start" "-a" "1efe71f94613316bd40795a02d2c643bafa2120cb28728d3a08bfef48a736a5d"`
[INFO] [stderr]    Compiling gap_vec v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | #![feature(core_intrinsics, alloc, raw_vec_internals)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `cap` found for type `alloc::raw_vec::RawVec<T>` in the current scope
[INFO] [stderr]    --> src/lib.rs:147:18
[INFO] [stderr]     |
[INFO] [stderr] 147 |         self.buf.cap()
[INFO] [stderr]     |                  ^^^ private field, not a method
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `cap` found for type `alloc::raw_vec::RawVec<_>` in the current scope
[INFO] [stderr]    --> src/lib.rs:306:49
[INFO] [stderr]     |
[INFO] [stderr] 306 |         let new_gap = self.gap.start .. new_buf.cap() - after_gap;
[INFO] [stderr]     |                                                 ^^^ private field, not a method
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `gap_vec`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1efe71f94613316bd40795a02d2c643bafa2120cb28728d3a08bfef48a736a5d"`
[INFO] running `"docker" "rm" "-f" "1efe71f94613316bd40795a02d2c643bafa2120cb28728d3a08bfef48a736a5d"`
[INFO] [stdout] 1efe71f94613316bd40795a02d2c643bafa2120cb28728d3a08bfef48a736a5d