[INFO] crate brainfuck 0.2.0 is already in cache
[INFO] extracting crate brainfuck 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/brainfuck/0.2.0
[INFO] extracting crate brainfuck 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/brainfuck/0.2.0
[INFO] validating manifest of brainfuck-0.2.0 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 brainfuck-0.2.0 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 brainfuck-0.2.0
[INFO] finished frobbing brainfuck-0.2.0
[INFO] frobbed toml for brainfuck-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/brainfuck/0.2.0/Cargo.toml
[INFO] started frobbing brainfuck-0.2.0
[INFO] finished frobbing brainfuck-0.2.0
[INFO] frobbed toml for brainfuck-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/brainfuck/0.2.0/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 brainfuck-0.2.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/brainfuck/0.2.0:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] f98eb9d8d1d2898e4ececc040ae7086a3cc2a0f1160e3eaa50594ce67234d695
[INFO] running `"docker" "start" "-a" "f98eb9d8d1d2898e4ececc040ae7086a3cc2a0f1160e3eaa50594ce67234d695"`
[INFO] [stderr]    Compiling docopt v0.6.86
[INFO] [stderr]    Compiling brainfuck v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:54:1
[INFO] [stderr]    |
[INFO] [stderr] 54 | #![feature(augmented_assignments)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/interpreter.rs:25:28
[INFO] [stderr]    |
[INFO] [stderr] 25 |     reader: Option<&'a mut Read>,
[INFO] [stderr]    |                            ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr]    |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]   --> src/lib.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 | #![deny(warnings)]
[INFO] [stderr]    |         ^^^^^^^^
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] implied by #[warn(warnings)]
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/interpreter.rs:26:28
[INFO] [stderr]    |
[INFO] [stderr] 26 |     writer: Option<&'a mut Write>,
[INFO] [stderr]    |                            ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `brainfuck`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f98eb9d8d1d2898e4ececc040ae7086a3cc2a0f1160e3eaa50594ce67234d695"`
[INFO] running `"docker" "rm" "-f" "f98eb9d8d1d2898e4ececc040ae7086a3cc2a0f1160e3eaa50594ce67234d695"`
[INFO] [stdout] f98eb9d8d1d2898e4ececc040ae7086a3cc2a0f1160e3eaa50594ce67234d695