[INFO] updating cached repository sinkuu/lambdarepl-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sinkuu/lambdarepl-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sinkuu/lambdarepl-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/sinkuu/lambdarepl-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sinkuu/lambdarepl-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sinkuu/lambdarepl-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sinkuu/lambdarepl-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sinkuu/lambdarepl-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1935917f90a8026b7240622f48f09c3eeb6d46d6
[INFO] sha for GitHub repo sinkuu/lambdarepl-rs: 1935917f90a8026b7240622f48f09c3eeb6d46d6
[INFO] validating manifest of sinkuu/lambdarepl-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 sinkuu/lambdarepl-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 sinkuu/lambdarepl-rs
[INFO] finished frobbing sinkuu/lambdarepl-rs
[INFO] frobbed toml for sinkuu/lambdarepl-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/sinkuu/lambdarepl-rs/Cargo.toml
[INFO] started frobbing sinkuu/lambdarepl-rs
[INFO] finished frobbing sinkuu/lambdarepl-rs
[INFO] frobbed toml for sinkuu/lambdarepl-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sinkuu/lambdarepl-rs/Cargo.toml
[INFO] crate sinkuu/lambdarepl-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 sinkuu/lambdarepl-rs 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-2/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/sinkuu/lambdarepl-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 9b3d453faa13db653fc656bac6b08ffa442f28b7d66b3f59fcee27f07509072f
[INFO] running `"docker" "start" "-a" "9b3d453faa13db653fc656bac6b08ffa442f28b7d66b3f59fcee27f07509072f"`
[INFO] [stderr]    Compiling combine v2.0.0-beta3
[INFO] [stderr]    Compiling nix v0.6.0
[INFO] [stderr]    Compiling linefeed v0.1.5
[INFO] [stderr]    Compiling lambdarepl 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(question_mark)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `letter`
[INFO] [stderr]    --> src/expr.rs:222:31
[INFO] [stderr]     |
[INFO] [stderr] 222 |     use combine::char::{char, letter, spaces};
[INFO] [stderr]     |                               ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `ToString` is imported redundantly
[INFO] [stderr]    --> src/expr.rs:224:9
[INFO] [stderr]     |
[INFO] [stderr] 224 |     use std::string::ToString;
[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 `lambdarepl`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9b3d453faa13db653fc656bac6b08ffa442f28b7d66b3f59fcee27f07509072f"`
[INFO] running `"docker" "rm" "-f" "9b3d453faa13db653fc656bac6b08ffa442f28b7d66b3f59fcee27f07509072f"`
[INFO] [stdout] 9b3d453faa13db653fc656bac6b08ffa442f28b7d66b3f59fcee27f07509072f