[INFO] crate ruukh 0.0.3 is already in cache
[INFO] extracting crate ruukh 0.0.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/ruukh/0.0.3
[INFO] extracting crate ruukh 0.0.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ruukh/0.0.3
[INFO] validating manifest of ruukh-0.0.3 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 ruukh-0.0.3 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 ruukh-0.0.3
[INFO] finished frobbing ruukh-0.0.3
[INFO] frobbed toml for ruukh-0.0.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/ruukh/0.0.3/Cargo.toml
[INFO] started frobbing ruukh-0.0.3
[INFO] finished frobbing ruukh-0.0.3
[INFO] frobbed toml for ruukh-0.0.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/ruukh/0.0.3/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 ruukh-0.0.3 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/reg/ruukh/0.0.3:/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] 82de51732446b6a8480340123170fecdfdb8177e771b8a92c66735dc44751d7d
[INFO] running `"docker" "start" "-a" "82de51732446b6a8480340123170fecdfdb8177e771b8a92c66735dc44751d7d"`
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.50
[INFO] [stderr]    Compiling bumpalo v2.6.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.50
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling backtrace v0.3.35
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.50
[INFO] [stderr]    Compiling synstructure v0.10.2
[INFO] [stderr]    Compiling ruukh-codegen v0.0.3
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.50
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.50
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.50
[INFO] [stderr]    Compiling js-sys v0.3.27
[INFO] [stderr]    Compiling web-sys v0.3.27
[INFO] [stderr]    Compiling ruukh v0.0.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/vdom/velement.rs:168:21
[INFO] [stderr]     |
[INFO] [stderr] 168 |                     write!(f, " {}=\"{}\"", k, v);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 35s
[INFO] running `"docker" "inspect" "82de51732446b6a8480340123170fecdfdb8177e771b8a92c66735dc44751d7d"`
[INFO] running `"docker" "rm" "-f" "82de51732446b6a8480340123170fecdfdb8177e771b8a92c66735dc44751d7d"`
[INFO] [stdout] 82de51732446b6a8480340123170fecdfdb8177e771b8a92c66735dc44751d7d
[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/reg/ruukh/0.0.3:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] e19c715cd8c6b0ef817a7cd78aaca1708ae9fc8c7fced58f40723bd62b45bfed
[INFO] running `"docker" "start" "-a" "e19c715cd8c6b0ef817a7cd78aaca1708ae9fc8c7fced58f40723bd62b45bfed"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling scoped-tls v1.0.0
[INFO] [stderr]    Compiling wasm-bindgen-test-macro v0.2.50
[INFO] [stderr]    Compiling console_error_panic_hook v0.1.6
[INFO] [stderr]    Compiling wasm-bindgen-futures v0.3.27
[INFO] [stderr]    Compiling wasm-bindgen-test v0.2.50
[INFO] [stderr]    Compiling ruukh v0.0.3 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/html.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro_hygiene)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/component.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro_hygiene, decl_macro)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 `ruukh`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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 `ruukh`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/vdom/velement.rs:168:21
[INFO] [stderr]     |
[INFO] [stderr] 168 |                     write!(f, " {}=\"{}\"", k, v);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]     = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "e19c715cd8c6b0ef817a7cd78aaca1708ae9fc8c7fced58f40723bd62b45bfed"`
[INFO] running `"docker" "rm" "-f" "e19c715cd8c6b0ef817a7cd78aaca1708ae9fc8c7fced58f40723bd62b45bfed"`
[INFO] [stdout] e19c715cd8c6b0ef817a7cd78aaca1708ae9fc8c7fced58f40723bd62b45bfed