[INFO] updating cached repository 49nord/unsafety-dance-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/49nord/unsafety-dance-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/49nord/unsafety-dance-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/49nord/unsafety-dance-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/49nord/unsafety-dance-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/49nord/unsafety-dance-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/49nord/unsafety-dance-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/49nord/unsafety-dance-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9402f94793606331559b0620a0950d7f64612c12
[INFO] sha for GitHub repo 49nord/unsafety-dance-rs: 9402f94793606331559b0620a0950d7f64612c12
[INFO] validating manifest of 49nord/unsafety-dance-rs 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 49nord/unsafety-dance-rs 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 49nord/unsafety-dance-rs
[INFO] finished frobbing 49nord/unsafety-dance-rs
[INFO] frobbed toml for 49nord/unsafety-dance-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/49nord/unsafety-dance-rs/Cargo.toml
[INFO] started frobbing 49nord/unsafety-dance-rs
[INFO] finished frobbing 49nord/unsafety-dance-rs
[INFO] frobbed toml for 49nord/unsafety-dance-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/49nord/unsafety-dance-rs/Cargo.toml
[INFO] crate 49nord/unsafety-dance-rs already has a lockfile, it will not be regenerated
[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 49nord/unsafety-dance-rs 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/gh/49nord/unsafety-dance-rs:/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] 24fdf4784d9a93b65d51cd2ae45038e4f74629b564c16e212e42fd68bb2fde54
[INFO] running `"docker" "start" "-a" "24fdf4784d9a93b65d51cd2ae45038e4f74629b564c16e212e42fd68bb2fde54"`
[INFO] [stderr]    Compiling unsafety-dance v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `rustc_driver::driver`
[INFO] [stderr]   --> src/main.rs:17:19
[INFO] [stderr]    |
[INFO] [stderr] 17 | use rustc_driver::driver::{CompileController, CompileState};
[INFO] [stderr]    |                   ^^^^^^ could not find `driver` in `rustc_driver`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `rustc_driver::CompilerCalls`
[INFO] [stderr]   --> src/main.rs:18:33
[INFO] [stderr]    |
[INFO] [stderr] 18 | use rustc_driver::{Compilation, CompilerCalls};
[INFO] [stderr]    |                                 ^^^^^^^^^^^^^ no `CompilerCalls` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `syntax::codemap`
[INFO] [stderr]   --> src/main.rs:19:19
[INFO] [stderr]    |
[INFO] [stderr] 19 | use syntax::{ast, codemap, visit};
[INFO] [stderr]    |                   ^^^^^^^ no `codemap` in the root
[INFO] [stderr] 
[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(rustc_private)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 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 `unsafety-dance`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "24fdf4784d9a93b65d51cd2ae45038e4f74629b564c16e212e42fd68bb2fde54"`
[INFO] running `"docker" "rm" "-f" "24fdf4784d9a93b65d51cd2ae45038e4f74629b564c16e212e42fd68bb2fde54"`
[INFO] [stdout] 24fdf4784d9a93b65d51cd2ae45038e4f74629b564c16e212e42fd68bb2fde54