[INFO] fetching crate casperlabs-contract-ffi 0.10.0...
[INFO] extracting crate casperlabs-contract-ffi 0.10.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/casperlabs-contract-ffi/0.10.0
[INFO] extracting crate casperlabs-contract-ffi 0.10.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/casperlabs-contract-ffi/0.10.0
[INFO] validating manifest of casperlabs-contract-ffi-0.10.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of casperlabs-contract-ffi-0.10.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing casperlabs-contract-ffi-0.10.0
[INFO] finished frobbing casperlabs-contract-ffi-0.10.0
[INFO] frobbed toml for casperlabs-contract-ffi-0.10.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/casperlabs-contract-ffi/0.10.0/Cargo.toml
[INFO] started frobbing casperlabs-contract-ffi-0.10.0
[INFO] finished frobbing casperlabs-contract-ffi-0.10.0
[INFO] frobbed toml for casperlabs-contract-ffi-0.10.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/casperlabs-contract-ffi/0.10.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing casperlabs-contract-ffi-0.10.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/casperlabs-contract-ffi/0.10.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 60c0d1c9dd9309b81f3ac27b9af347f2524c70eaedf8a4544d3e774da0dba344
[INFO] running `"docker" "start" "-a" "60c0d1c9dd9309b81f3ac27b9af347f2524c70eaedf8a4544d3e774da0dba344"`
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling subtle v1.0.0
[INFO] [stderr]    Compiling wee_alloc v0.4.4
[INFO] [stderr]    Compiling opaque-debug v0.2.3
[INFO] [stderr]    Compiling rustc-hex v2.0.1
[INFO] [stderr]    Compiling memory_units v0.4.0
[INFO] [stderr]    Compiling byte-tools v0.3.1
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling uint v0.7.1
[INFO] [stderr]    Compiling generic-array v0.12.3
[INFO] [stderr]    Compiling digest v0.8.1
[INFO] [stderr]    Compiling crypto-mac v0.7.0
[INFO] [stderr]    Compiling blake2 v0.8.0
[INFO] [stderr]    Compiling num v0.2.0
[INFO] [stderr]    Compiling casperlabs-contract-ffi v0.10.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:2:1
[INFO] [stderr]    |
[INFO] [stderr] 2  | / #![feature(
[INFO] [stderr] 3  | |     alloc,
[INFO] [stderr] 4  | |     allocator_api,
[INFO] [stderr] 5  | |     core_intrinsics,
[INFO] [stderr] ...  |
[INFO] [stderr] 9  | |     try_reserve
[INFO] [stderr] 10 | | )]
[INFO] [stderr]    | |__^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no function or associated item named `uninitialized` found for type `core::mem::MaybeUninit<_>` in the current scope
[INFO] [stderr]    --> src/bytesrepr.rs:355:63
[INFO] [stderr]     |
[INFO] [stderr] 355 |         let mut result: MaybeUninit<[T; N256]> = MaybeUninit::uninitialized();
[INFO] [stderr]     |                                                               ^^^^^^^^^^^^^ function or associated item not found in `core::mem::MaybeUninit<_>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `into_initialized` found for type `core::mem::MaybeUninit<[T; 256]>` in the current scope
[INFO] [stderr]    --> src/bytesrepr.rs:363:24
[INFO] [stderr]     |
[INFO] [stderr] 363 |             Ok((result.into_initialized(), stream))
[INFO] [stderr]     |                        ^^^^^^^^^^^^^^^^
[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 `casperlabs-contract-ffi`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "60c0d1c9dd9309b81f3ac27b9af347f2524c70eaedf8a4544d3e774da0dba344"`
[INFO] running `"docker" "rm" "-f" "60c0d1c9dd9309b81f3ac27b9af347f2524c70eaedf8a4544d3e774da0dba344"`
[INFO] [stdout] 60c0d1c9dd9309b81f3ac27b9af347f2524c70eaedf8a4544d3e774da0dba344