[INFO] updating cached repository hajifkd/custom-rustc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/hajifkd/custom-rustc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/hajifkd/custom-rustc" "work/ex/beta-1.38-1/sources/1.37.0/gh/hajifkd/custom-rustc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/hajifkd/custom-rustc'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/hajifkd/custom-rustc" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hajifkd/custom-rustc"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hajifkd/custom-rustc'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2cda9e472047c66cc8ac8d5e4977790026870f9b
[INFO] sha for GitHub repo hajifkd/custom-rustc: 2cda9e472047c66cc8ac8d5e4977790026870f9b
[INFO] validating manifest of hajifkd/custom-rustc 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 hajifkd/custom-rustc 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 hajifkd/custom-rustc
[INFO] finished frobbing hajifkd/custom-rustc
[INFO] frobbed toml for hajifkd/custom-rustc written to work/ex/beta-1.38-1/sources/1.37.0/gh/hajifkd/custom-rustc/Cargo.toml
[INFO] started frobbing hajifkd/custom-rustc
[INFO] finished frobbing hajifkd/custom-rustc
[INFO] frobbed toml for hajifkd/custom-rustc written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hajifkd/custom-rustc/Cargo.toml
[INFO] crate hajifkd/custom-rustc 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] [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 hajifkd/custom-rustc against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hajifkd/custom-rustc:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 54ea148eb2cc2c9439708a4a4cfcaf4dbc38f1d03a21342269f5a2a6e63347f3
[INFO] running `"docker" "start" "-a" "54ea148eb2cc2c9439708a4a4cfcaf4dbc38f1d03a21342269f5a2a6e63347f3"`
[INFO] [stderr]    Compiling custom-rustc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `rustc_driver::driver`
[INFO] [stderr]  --> src/main.rs:9:19
[INFO] [stderr]   |
[INFO] [stderr] 9 | 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:10:47
[INFO] [stderr]    |
[INFO] [stderr] 10 | use rustc_driver::{run_compiler, Compilation, CompilerCalls};
[INFO] [stderr]    |                                               ^^^^^^^^^^^^^ no `CompilerCalls` in the root
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta 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 3 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 `custom-rustc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "54ea148eb2cc2c9439708a4a4cfcaf4dbc38f1d03a21342269f5a2a6e63347f3"`
[INFO] running `"docker" "rm" "-f" "54ea148eb2cc2c9439708a4a4cfcaf4dbc38f1d03a21342269f5a2a6e63347f3"`
[INFO] [stdout] 54ea148eb2cc2c9439708a4a4cfcaf4dbc38f1d03a21342269f5a2a6e63347f3