[INFO] crate better-web-view 0.6.0 is already in cache
[INFO] extracting crate better-web-view 0.6.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/better-web-view/0.6.0
[INFO] extracting crate better-web-view 0.6.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/better-web-view/0.6.0
[INFO] validating manifest of better-web-view-0.6.0 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 better-web-view-0.6.0 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 better-web-view-0.6.0
[INFO] finished frobbing better-web-view-0.6.0
[INFO] frobbed toml for better-web-view-0.6.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/better-web-view/0.6.0/Cargo.toml
[INFO] started frobbing better-web-view-0.6.0
[INFO] finished frobbing better-web-view-0.6.0
[INFO] frobbed toml for better-web-view-0.6.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/better-web-view/0.6.0/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 better-web-view-0.6.0 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/better-web-view/0.6.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 4dac544b51ac30be6d50d1d65ebbaf19ea8b956648495add820ef2e5d689bbf2
[INFO] running `"docker" "start" "-a" "4dac544b51ac30be6d50d1d65ebbaf19ea8b956648495add820ef2e5d689bbf2"`
[INFO] [stderr]    Compiling webview-sys v0.1.2
[INFO] [stderr]    Compiling better-web-view v0.6.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/error.rs:28:16
[INFO] [stderr]    |
[INFO] [stderr] 28 |     Custom(Box<CustomError>),
[INFO] [stderr]    |                ^^^^^^^^^^^ help: use `dyn`: `dyn CustomError`
[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/error.rs:39:32
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn cause(&self) -> Option<&error::Error> {
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lib.rs:241:25
[INFO] [stderr]     |
[INFO] [stderr] 241 |     invoke_handler: Box<FnMut(&mut WebView<T>, &str) -> WVResult + 'a>,
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&mut WebView<T>, &str) -> WVResult + 'a`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/lib.rs:287:22
[INFO] [stderr]     |
[INFO] [stderr] 287 |                 Some(ffi_invoke_handler::<T>),
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^ expected "C" fn, found "system" fn
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `extern "C" fn(*mut ffi::CWebView, *const i8)`
[INFO] [stderr]                found type `extern "system" fn(*mut ffi::CWebView, *const i8) {ffi_invoke_handler::<T>}`
[INFO] [stderr] 
[INFO] [stderr] error[E0605]: non-primitive cast: `extern "system" fn(*mut ffi::CWebView, *mut std::ffi::c_void) {ffi_dispatch_handler::<T>}` as `extern "C" fn(*mut ffi::CWebView, *mut std::ffi::c_void)`
[INFO] [stderr]    --> src/lib.rs:502:22
[INFO] [stderr]     |
[INFO] [stderr] 502 |                 Some(ffi_dispatch_handler::<T> as _),
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: an `as` expression can only be used to convert between primitive types. Consider using the `From` trait
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0308, E0605.
[INFO] [stderr] For more information about an error, try `rustc --explain E0308`.
[INFO] [stderr] error: Could not compile `better-web-view`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "4dac544b51ac30be6d50d1d65ebbaf19ea8b956648495add820ef2e5d689bbf2"`
[INFO] running `"docker" "rm" "-f" "4dac544b51ac30be6d50d1d65ebbaf19ea8b956648495add820ef2e5d689bbf2"`
[INFO] [stdout] 4dac544b51ac30be6d50d1d65ebbaf19ea8b956648495add820ef2e5d689bbf2