[INFO] crate lobby 0.0.1 is already in cache
[INFO] extracting crate lobby 0.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/lobby/0.0.1
[INFO] extracting crate lobby 0.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/lobby/0.0.1
[INFO] validating manifest of lobby-0.0.1 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 lobby-0.0.1 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 lobby-0.0.1
[INFO] finished frobbing lobby-0.0.1
[INFO] frobbed toml for lobby-0.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/lobby/0.0.1/Cargo.toml
[INFO] started frobbing lobby-0.0.1
[INFO] finished frobbing lobby-0.0.1
[INFO] frobbed toml for lobby-0.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/lobby/0.0.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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] [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 lobby-0.0.1 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/lobby/0.0.1:/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] 14e76e852676b58c4da34ab0cbdb533923e0ad5dcea7c1e9a7f77ee917cfff4e
[INFO] running `"docker" "start" "-a" "14e76e852676b58c4da34ab0cbdb533923e0ad5dcea7c1e9a7f77ee917cfff4e"`
[INFO] [stderr]    Compiling lobby v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::collections::VecMap`
[INFO] [stderr]   --> src/lib.rs:38:34
[INFO] [stderr]    |
[INFO] [stderr] 38 | use std::collections::{VecDeque, VecMap};
[INFO] [stderr]    |                                  ^^^^^^ no `VecMap` in `collections`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:35:1
[INFO] [stderr]    |
[INFO] [stderr] 35 | #![feature(collections, io, net)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0107]: wrong number of type arguments: expected 1, found 0
[INFO] [stderr]   --> src/lib.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |     thread: JoinHandle,
[INFO] [stderr]    |             ^^^^^^^^^^ expected 1 type argument
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0107, E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0107`.
[INFO] [stderr] error: Could not compile `lobby`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "14e76e852676b58c4da34ab0cbdb533923e0ad5dcea7c1e9a7f77ee917cfff4e"`
[INFO] running `"docker" "rm" "-f" "14e76e852676b58c4da34ab0cbdb533923e0ad5dcea7c1e9a7f77ee917cfff4e"`
[INFO] [stdout] 14e76e852676b58c4da34ab0cbdb533923e0ad5dcea7c1e9a7f77ee917cfff4e