[INFO] updating cached repository paavohuhtala/bfcrs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/paavohuhtala/bfcrs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/paavohuhtala/bfcrs" "work/ex/beta-1.38-1/sources/1.37.0/gh/paavohuhtala/bfcrs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/paavohuhtala/bfcrs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/paavohuhtala/bfcrs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/paavohuhtala/bfcrs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/paavohuhtala/bfcrs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cfa75356188b83ce56b1de13366bd431c304cfa2
[INFO] sha for GitHub repo paavohuhtala/bfcrs: cfa75356188b83ce56b1de13366bd431c304cfa2
[INFO] validating manifest of paavohuhtala/bfcrs 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 paavohuhtala/bfcrs 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 paavohuhtala/bfcrs
[INFO] finished frobbing paavohuhtala/bfcrs
[INFO] frobbed toml for paavohuhtala/bfcrs written to work/ex/beta-1.38-1/sources/1.37.0/gh/paavohuhtala/bfcrs/Cargo.toml
[INFO] started frobbing paavohuhtala/bfcrs
[INFO] finished frobbing paavohuhtala/bfcrs
[INFO] frobbed toml for paavohuhtala/bfcrs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/paavohuhtala/bfcrs/Cargo.toml
[INFO] crate paavohuhtala/bfcrs 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 paavohuhtala/bfcrs 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/paavohuhtala/bfcrs:/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] 14343791113b09b6824eec6ddb08589d2203aa087255a3e7e2053c95255d6e7e
[INFO] running `"docker" "start" "-a" "14343791113b09b6824eec6ddb08589d2203aa087255a3e7e2053c95255d6e7e"`
[INFO] [stderr]    Compiling leb128 v0.2.3
[INFO] [stderr]    Compiling bfcrs 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(iterator_find_map)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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(iterator_flatten)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/backend/wasm/code_stream.rs:85:66
[INFO] [stderr]    |
[INFO] [stderr] 85 |   pub fn emit_print_string(&mut self, s: &str) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                  ^^^^^ help: use `dyn`: `dyn Error`
[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/backend/wasm/code_stream.rs:93:61
[INFO] [stderr]    |
[INFO] [stderr] 93 |   pub fn emit(&mut self, op: Instruction) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/backend/wasm/module_builder.rs:29:56
[INFO] [stderr]    |
[INFO] [stderr] 29 |   pub fn add_section(&mut self, id: u8, entries: &[Box<Fn(&mut dyn Write) -> ()>]) {
[INFO] [stderr]    |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&mut dyn Write) -> ()`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/backend/wasm/module_builder.rs:40:82
[INFO] [stderr]    |
[INFO] [stderr] 40 |   pub fn write_to_stream(mut self, mut stream: &mut dyn Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                                  ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/backend/wasm/module_builder.rs:66:21
[INFO] [stderr]    |
[INFO] [stderr] 66 | ) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                     ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/backend/wasm/module_builder.rs:321:23
[INFO] [stderr]     |
[INFO] [stderr] 321 |   ) -> Result<(), Box<Error>> {
[INFO] [stderr]     |                       ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/backend/mod.rs:12:6
[INFO] [stderr]    |
[INFO] [stderr] 12 | impl Backend {
[INFO] [stderr]    |      ^^^^^^^ help: use `dyn`: `dyn Backend`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/backend/mod.rs:13:46
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn from_name(name: &str) -> Option<Box<Backend>> {
[INFO] [stderr]    |                                              ^^^^^^^ help: use `dyn`: `dyn Backend`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `bfcrs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "14343791113b09b6824eec6ddb08589d2203aa087255a3e7e2053c95255d6e7e"`
[INFO] running `"docker" "rm" "-f" "14343791113b09b6824eec6ddb08589d2203aa087255a3e7e2053c95255d6e7e"`
[INFO] [stdout] 14343791113b09b6824eec6ddb08589d2203aa087255a3e7e2053c95255d6e7e