[INFO] crate veryfast 0.3.1 is already in cache
[INFO] extracting crate veryfast 0.3.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/veryfast/0.3.1
[INFO] extracting crate veryfast 0.3.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/veryfast/0.3.1
[INFO] validating manifest of veryfast-0.3.1 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 veryfast-0.3.1 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 veryfast-0.3.1
[INFO] finished frobbing veryfast-0.3.1
[INFO] frobbed toml for veryfast-0.3.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/veryfast/0.3.1/Cargo.toml
[INFO] started frobbing veryfast-0.3.1
[INFO] finished frobbing veryfast-0.3.1
[INFO] frobbed toml for veryfast-0.3.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/veryfast/0.3.1/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing veryfast-0.3.1 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-2/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/veryfast/0.3.1:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] b7ae8651377c5fcdf76ce511e569cb977950cd4a5c851492463edbcf7c541cdf
[INFO] running `"docker" "start" "-a" "b7ae8651377c5fcdf76ce511e569cb977950cd4a5c851492463edbcf7c541cdf"`
[INFO] [stderr]    Compiling veryfast v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::heap`
[INFO] [stderr]   --> src/pool.rs:73:10
[INFO] [stderr]    |
[INFO] [stderr] 73 | use std::heap::{Heap, Layout, Alloc};
[INFO] [stderr]    |          ^^^^ could not find `heap` in `std`
[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(allocator_api)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(arc_counts)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/pool.rs:194:13
[INFO] [stderr]     |
[INFO] [stderr] 182 |     fn expand(&self) -> *mut T {
[INFO] [stderr]     |                         ------ expected `*mut T` because of return type
[INFO] [stderr] ...
[INFO] [stderr] 194 |             extra
[INFO] [stderr]     |             ^^^^^ types differ in mutability
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `*mut T`
[INFO] [stderr]                found type `*const T`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `veryfast`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b7ae8651377c5fcdf76ce511e569cb977950cd4a5c851492463edbcf7c541cdf"`
[INFO] running `"docker" "rm" "-f" "b7ae8651377c5fcdf76ce511e569cb977950cd4a5c851492463edbcf7c541cdf"`
[INFO] [stdout] b7ae8651377c5fcdf76ce511e569cb977950cd4a5c851492463edbcf7c541cdf