[INFO] crate clucstr 1.1.91 is already in cache
[INFO] testing clucstr-1.1.91 against 1.38.0 for beta-1.39-1
[INFO] extracting crate clucstr 1.1.91 into work/builds/worker-6/source
[INFO] validating manifest of crates.io crate clucstr 1.1.91 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate clucstr 1.1.91
[INFO] finished tweaking crates.io crate clucstr 1.1.91
[INFO] tweaked toml for crates.io crate clucstr 1.1.91 written to work/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate clucstr 1.1.91 already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 092c5308de4f7bf0af5cab51b5dccad15953044b8b76ae7d0f9f579cf2326087
[INFO] running `"docker" "start" "-a" "092c5308de4f7bf0af5cab51b5dccad15953044b8b76ae7d0f9f579cf2326087"`
[INFO] [stderr]    Compiling clucstr v1.1.91 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `rustc_driver::plugin`
[INFO] [stderr]   --> src/nightly.rs:19:19
[INFO] [stderr]    |
[INFO] [stderr] 19 | use rustc_driver::plugin::Registry;
[INFO] [stderr]    |                   ^^^^^^ could not find `plugin` in `rustc_driver`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:195:1
[INFO] [stderr]     |
[INFO] [stderr] 195 | #![feature(plugin_registrar, rustc_private)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `clucstr`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "092c5308de4f7bf0af5cab51b5dccad15953044b8b76ae7d0f9f579cf2326087"`
[INFO] running `"docker" "rm" "-f" "092c5308de4f7bf0af5cab51b5dccad15953044b8b76ae7d0f9f579cf2326087"`
[INFO] [stdout] 092c5308de4f7bf0af5cab51b5dccad15953044b8b76ae7d0f9f579cf2326087