[INFO] crate treescript-interpreter 0.1.1 is already in cache
[INFO] extracting crate treescript-interpreter 0.1.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/treescript-interpreter/0.1.1
[INFO] extracting crate treescript-interpreter 0.1.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/treescript-interpreter/0.1.1
[INFO] validating manifest of treescript-interpreter-0.1.1 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 treescript-interpreter-0.1.1 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 treescript-interpreter-0.1.1
[INFO] finished frobbing treescript-interpreter-0.1.1
[INFO] frobbed toml for treescript-interpreter-0.1.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/treescript-interpreter/0.1.1/Cargo.toml
[INFO] started frobbing treescript-interpreter-0.1.1
[INFO] finished frobbing treescript-interpreter-0.1.1
[INFO] frobbed toml for treescript-interpreter-0.1.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/treescript-interpreter/0.1.1/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 treescript-interpreter-0.1.1 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/treescript-interpreter/0.1.1:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 585ec4aaddef7ddc425dce435e3f901d12cb9e909bc0aa4c1cecf399e36d0296
[INFO] running `"docker" "start" "-a" "585ec4aaddef7ddc425dce435e3f901d12cb9e909bc0aa4c1cecf399e36d0296"`
[INFO] [stderr]    Compiling array-macro v1.0.3
[INFO] [stderr]    Compiling unicode_reader v0.1.1
[INFO] [stderr]    Compiling app_dirs v1.2.1
[INFO] [stderr]    Compiling enum-map-derive v0.4.2
[INFO] [stderr]    Compiling serde_repr v0.1.5
[INFO] [stderr]    Compiling rmp v0.8.7
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling enum-map-internals v0.1.3
[INFO] [stderr]    Compiling rmp-serde v0.13.7
[INFO] [stderr]    Compiling enum-map v0.5.0
[INFO] [stderr]    Compiling treescript-interpreter v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(refcell_map_split, generators, generator_trait)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/session.rs:214:64
[INFO] [stderr]     |
[INFO] [stderr] 214 |   pub fn read_ast<P: AsRef<Path>>(&self, input_path: P) -> Box<Read> {
[INFO] [stderr]     |                                                                ^^^^ help: use `dyn`: `dyn Read`
[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/session.rs:233:57
[INFO] [stderr]     |
[INFO] [stderr] 233 |   pub fn write_ast(&self, output_path: PathBuf) -> (Box<Write>, AtomicFileCommit) {
[INFO] [stderr]     |                                                         ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `resume` found for type `G` in the current scope
[INFO] [stderr]   --> src/util.rs:52:27
[INFO] [stderr]    |
[INFO] [stderr] 52 |     match unsafe { self.0.resume() } {
[INFO] [stderr]    |                           ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the type parameter is bounded by the trait
[INFO] [stderr] help: the following trait defines an item `resume`, perhaps you need to restrict type parameter `G` with it:
[INFO] [stderr]    |
[INFO] [stderr] 45 | impl<G: std::ops::Generator> Iterator for GeneratorIterator<G>
[INFO] [stderr]    |      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 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 `treescript-interpreter`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "585ec4aaddef7ddc425dce435e3f901d12cb9e909bc0aa4c1cecf399e36d0296"`
[INFO] running `"docker" "rm" "-f" "585ec4aaddef7ddc425dce435e3f901d12cb9e909bc0aa4c1cecf399e36d0296"`
[INFO] [stdout] 585ec4aaddef7ddc425dce435e3f901d12cb9e909bc0aa4c1cecf399e36d0296