[INFO] updating cached repository alexsparrow/rsbf
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/alexsparrow/rsbf
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/alexsparrow/rsbf" "work/ex/beta-1.38-1/sources/1.37.0/gh/alexsparrow/rsbf"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/alexsparrow/rsbf'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/alexsparrow/rsbf" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alexsparrow/rsbf"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alexsparrow/rsbf'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c58ba7534416b4ee9d26a9590cd3802cc736fdd6
[INFO] sha for GitHub repo alexsparrow/rsbf: c58ba7534416b4ee9d26a9590cd3802cc736fdd6
[INFO] validating manifest of alexsparrow/rsbf 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 alexsparrow/rsbf 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 alexsparrow/rsbf
[INFO] finished frobbing alexsparrow/rsbf
[INFO] frobbed toml for alexsparrow/rsbf written to work/ex/beta-1.38-1/sources/1.37.0/gh/alexsparrow/rsbf/Cargo.toml
[INFO] started frobbing alexsparrow/rsbf
[INFO] finished frobbing alexsparrow/rsbf
[INFO] frobbed toml for alexsparrow/rsbf written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alexsparrow/rsbf/Cargo.toml
[INFO] crate alexsparrow/rsbf already has a lockfile, it will not be regenerated
[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 alexsparrow/rsbf 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/alexsparrow/rsbf:/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] 2361c0cb9e7e4bfcacdd9a43aaac6335fc4effada162f51c8eebab344736a049
[INFO] running `"docker" "start" "-a" "2361c0cb9e7e4bfcacdd9a43aaac6335fc4effada162f51c8eebab344736a049"`
[INFO] [stderr]    Compiling rsbf v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(str_char)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:40:42
[INFO] [stderr]    |
[INFO] [stderr] 40 | fn output(state: &mut State, write: &mut Write) {
[INFO] [stderr]    |                                          ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:72:57
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn interpret(s:&str, state: &mut State, write: &mut Write) {
[INFO] [stderr]    |                                                         ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/lib.rs:50:21
[INFO] [stderr]    |
[INFO] [stderr] 50 |             if code.char_at(state.pc) == ']' {
[INFO] [stderr]    |                     ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/lib.rs:74:19
[INFO] [stderr]    |
[INFO] [stderr] 74 |         let c = s.char_at(state.pc);
[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 `rsbf`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2361c0cb9e7e4bfcacdd9a43aaac6335fc4effada162f51c8eebab344736a049"`
[INFO] running `"docker" "rm" "-f" "2361c0cb9e7e4bfcacdd9a43aaac6335fc4effada162f51c8eebab344736a049"`
[INFO] [stdout] 2361c0cb9e7e4bfcacdd9a43aaac6335fc4effada162f51c8eebab344736a049