[INFO] updating cached repository kriw/regex_vm
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kriw/regex_vm
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kriw/regex_vm" "work/ex/beta-1.38-1/sources/1.37.0/gh/kriw/regex_vm"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kriw/regex_vm'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kriw/regex_vm" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kriw/regex_vm"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kriw/regex_vm'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1d17f3a5917b967c4fcded7bd4200de23d708166
[INFO] sha for GitHub repo kriw/regex_vm: 1d17f3a5917b967c4fcded7bd4200de23d708166
[INFO] validating manifest of kriw/regex_vm 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 kriw/regex_vm 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 kriw/regex_vm
[INFO] finished frobbing kriw/regex_vm
[INFO] frobbed toml for kriw/regex_vm written to work/ex/beta-1.38-1/sources/1.37.0/gh/kriw/regex_vm/Cargo.toml
[INFO] started frobbing kriw/regex_vm
[INFO] finished frobbing kriw/regex_vm
[INFO] frobbed toml for kriw/regex_vm written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kriw/regex_vm/Cargo.toml
[INFO] crate kriw/regex_vm 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 kriw/regex_vm 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/kriw/regex_vm:/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] 67fbcb1a388dcadac1a8e9c6643346acc9f605f4142a3bda0ee4a05b962949d7
[INFO] running `"docker" "start" "-a" "67fbcb1a388dcadac1a8e9c6643346acc9f605f4142a3bda0ee4a05b962949d7"`
[INFO] [stderr]    Compiling regex_vm v0.1.0 (/opt/crater/workdir)
[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(box_syntax, box_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `parser::Ast`
[INFO] [stderr]  --> src/vm.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use parser::Ast;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::thread`
[INFO] [stderr]  --> src/vm_ir.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::thread;
[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 `regex_vm`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "67fbcb1a388dcadac1a8e9c6643346acc9f605f4142a3bda0ee4a05b962949d7"`
[INFO] running `"docker" "rm" "-f" "67fbcb1a388dcadac1a8e9c6643346acc9f605f4142a3bda0ee4a05b962949d7"`
[INFO] [stdout] 67fbcb1a388dcadac1a8e9c6643346acc9f605f4142a3bda0ee4a05b962949d7