[INFO] crate cortex 0.1.5 is already in cache
[INFO] extracting crate cortex 0.1.5 into work/ex/beta-1.38-1/sources/1.37.0/reg/cortex/0.1.5
[INFO] extracting crate cortex 0.1.5 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cortex/0.1.5
[INFO] validating manifest of cortex-0.1.5 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 cortex-0.1.5 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 cortex-0.1.5
[INFO] finished frobbing cortex-0.1.5
[INFO] frobbed toml for cortex-0.1.5 written to work/ex/beta-1.38-1/sources/1.37.0/reg/cortex/0.1.5/Cargo.toml
[INFO] started frobbing cortex-0.1.5
[INFO] finished frobbing cortex-0.1.5
[INFO] frobbed toml for cortex-0.1.5 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cortex/0.1.5/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 cortex-0.1.5 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/cortex/0.1.5:/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] f7e9d452f0cb020754f077ed638ac617bee74341bcaa04795cb0ac750075270b
[INFO] running `"docker" "start" "-a" "f7e9d452f0cb020754f077ed638ac617bee74341bcaa04795cb0ac750075270b"`
[INFO] [stderr]    Compiling cortex v0.1.5 (/opt/crater/workdir)
[INFO] [stderr] error[E0277]: the size for values of type `Self` cannot be known at compilation time
[INFO] [stderr]   --> src/cortex/mod.rs:24:2
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn register(&mut self, cortex: Box<Cortex<T, Self>>) { }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[INFO] [stderr]    |
[INFO] [stderr]    = help: the trait `std::marker::Sized` is not implemented for `Self`
[INFO] [stderr]    = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
[INFO] [stderr]    = help: consider adding a `where Self: std::marker::Sized` bound
[INFO] [stderr] note: required by `cortex::Cortex`
[INFO] [stderr]   --> src/cortex/mod.rs:4:1
[INFO] [stderr]    |
[INFO] [stderr] 4  | pub struct Cortex<T: Debug, X: Observer<T>> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0277`.
[INFO] [stderr] error: Could not compile `cortex`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f7e9d452f0cb020754f077ed638ac617bee74341bcaa04795cb0ac750075270b"`
[INFO] running `"docker" "rm" "-f" "f7e9d452f0cb020754f077ed638ac617bee74341bcaa04795cb0ac750075270b"`
[INFO] [stdout] f7e9d452f0cb020754f077ed638ac617bee74341bcaa04795cb0ac750075270b