[INFO] crate diff2html 0.2.3 is already in cache
[INFO] extracting crate diff2html 0.2.3 into work/ex/beta-1.38-1/sources/1.37.0/reg/diff2html/0.2.3
[INFO] extracting crate diff2html 0.2.3 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/diff2html/0.2.3
[INFO] validating manifest of diff2html-0.2.3 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 diff2html-0.2.3 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 diff2html-0.2.3
[INFO] finished frobbing diff2html-0.2.3
[INFO] frobbed toml for diff2html-0.2.3 written to work/ex/beta-1.38-1/sources/1.37.0/reg/diff2html/0.2.3/Cargo.toml
[INFO] started frobbing diff2html-0.2.3
[INFO] finished frobbing diff2html-0.2.3
[INFO] frobbed toml for diff2html-0.2.3 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/diff2html/0.2.3/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing diff2html-0.2.3 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/diff2html/0.2.3:/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] 15266b63ef44616d127d357fe684de89fa1e5be4787b7f0ec27b9b8641701a0a
[INFO] running `"docker" "start" "-a" "15266b63ef44616d127d357fe684de89fa1e5be4787b7f0ec27b9b8641701a0a"`
[INFO] [stderr]    Compiling seahash v3.0.6
[INFO] [stderr]    Compiling encoding_rs_io v0.1.6
[INFO] [stderr]    Compiling v_escape_derive v0.5.5
[INFO] [stderr]    Compiling handlebars v1.1.0
[INFO] [stderr]    Compiling v_escape v0.7.4
[INFO] [stderr]    Compiling v_htmlescape v0.4.5
[INFO] [stderr]    Compiling diff2html v0.2.3 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(pattern)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:64:22
[INFO] [stderr]    |
[INFO] [stderr] 64 |     let mut out: Box<Write> = if let Some(file) = &config.file {
[INFO] [stderr]    |                      ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[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 `diff2html`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "15266b63ef44616d127d357fe684de89fa1e5be4787b7f0ec27b9b8641701a0a"`
[INFO] running `"docker" "rm" "-f" "15266b63ef44616d127d357fe684de89fa1e5be4787b7f0ec27b9b8641701a0a"`
[INFO] [stdout] 15266b63ef44616d127d357fe684de89fa1e5be4787b7f0ec27b9b8641701a0a