[INFO] updating cached repository alanwilhelm/starling-genesis
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/alanwilhelm/starling-genesis
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/alanwilhelm/starling-genesis" "work/ex/beta-1.38-1/sources/1.37.0/gh/alanwilhelm/starling-genesis"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/alanwilhelm/starling-genesis'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/alanwilhelm/starling-genesis" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alanwilhelm/starling-genesis"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alanwilhelm/starling-genesis'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 39c845b4b014123b1473ee6bc3c5188953ade27e
[INFO] sha for GitHub repo alanwilhelm/starling-genesis: 39c845b4b014123b1473ee6bc3c5188953ade27e
[INFO] validating manifest of alanwilhelm/starling-genesis 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 alanwilhelm/starling-genesis 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 alanwilhelm/starling-genesis
[INFO] finished frobbing alanwilhelm/starling-genesis
[INFO] frobbed toml for alanwilhelm/starling-genesis written to work/ex/beta-1.38-1/sources/1.37.0/gh/alanwilhelm/starling-genesis/Cargo.toml
[INFO] started frobbing alanwilhelm/starling-genesis
[INFO] finished frobbing alanwilhelm/starling-genesis
[INFO] frobbed toml for alanwilhelm/starling-genesis written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/alanwilhelm/starling-genesis/Cargo.toml
[INFO] crate alanwilhelm/starling-genesis 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] [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 alanwilhelm/starling-genesis 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/alanwilhelm/starling-genesis:/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] fce0a6c1a431335fe740ab6f2d4ef2fab222a7c63b02b6de945aee4b6f5f3fd0
[INFO] running `"docker" "start" "-a" "fce0a6c1a431335fe740ab6f2d4ef2fab222a7c63b02b6de945aee4b6f5f3fd0"`
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling base-x v0.2.2
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling integer-encoding v1.0.5
[INFO] [stderr]    Compiling byte-tools v0.1.3
[INFO] [stderr]    Compiling array-macro v1.0.2
[INFO] [stderr]    Compiling serde v1.0.55
[INFO] [stderr]    Compiling reexport-proc-macro v1.0.2
[INFO] [stderr]    Compiling byteorder v0.4.2
[INFO] [stderr]    Compiling enumset v0.3.3
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling net2 v0.2.32
[INFO] [stderr]    Compiling time v0.1.40
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling ncurses v5.91.0
[INFO] [stderr]    Compiling multibase v0.6.0
[INFO] [stderr]    Compiling bytes v0.4.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling mio v0.6.14
[INFO] [stderr]    Compiling generic-array v0.6.0
[INFO] [stderr]    Compiling syn v0.13.10
[INFO] [stderr]    Compiling tiny-keccak v1.4.1
[INFO] [stderr]    Compiling digest-buffer v0.2.0
[INFO] [stderr]    Compiling digest v0.4.0
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling tokio-threadpool v0.1.3
[INFO] [stderr]    Compiling sha2 v0.4.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling tokio-io v0.1.6
[INFO] [stderr]    Compiling easy-hash v0.1.0
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.1.43
[INFO] [stderr]    Compiling tokio-reactor v0.1.1
[INFO] [stderr]    Compiling tokio-fs v0.1.0
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling tokio-tcp v0.1.0
[INFO] [stderr]    Compiling tokio-udp v0.1.0
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling tokio v0.1.6
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling enum-map-derive v0.2.5
[INFO] [stderr]    Compiling ring v0.12.1
[INFO] [stderr]    Compiling toml v0.4.6
[INFO] [stderr]    Compiling enum-map v0.2.29
[INFO] [stderr]    Compiling cursive v0.9.0-alpha.0 (https://github.com/gyscos/Cursive#4a3bbbb9)
[INFO] [stderr]    Compiling multihash v0.7.0
[INFO] [stderr]    Compiling cid v0.2.3
[INFO] [stderr]    Compiling multiaddr v0.3.0
[INFO] [stderr]    Compiling murmur v0.1.0 (https://github.com/alanwilhelm/murmur#26ad0148)
[INFO] [stderr]    Compiling starling v0.1.0 (/opt/crater/workdir)
[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(iterator_step_by)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Receiver`, `Sender`
[INFO] [stderr]  --> src/pow/mod.rs:3:23
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::sync::mpsc::{Sender, Receiver};
[INFO] [stderr]   |                       ^^^^^^  ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `TextView`
[INFO] [stderr]  --> src/cursive_ui/mod.rs:2:30
[INFO] [stderr]   |
[INFO] [stderr] 2 | use cursive::views::{Dialog, TextView};
[INFO] [stderr]   |                              ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `cursive::Cursive`
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use cursive::Cursive;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Dialog`, `TextView`
[INFO] [stderr]   --> src/main.rs:12:22
[INFO] [stderr]    |
[INFO] [stderr] 12 | use cursive::views::{Dialog, TextView};
[INFO] [stderr]    |                      ^^^^^^  ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `cursive_ui::*`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use cursive_ui::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Receiver`, `Sender`
[INFO] [stderr]   --> src/main.rs:14:23
[INFO] [stderr]    |
[INFO] [stderr] 14 | use std::sync::mpsc::{Sender, Receiver};
[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 `starling`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "fce0a6c1a431335fe740ab6f2d4ef2fab222a7c63b02b6de945aee4b6f5f3fd0"`
[INFO] running `"docker" "rm" "-f" "fce0a6c1a431335fe740ab6f2d4ef2fab222a7c63b02b6de945aee4b6f5f3fd0"`
[INFO] [stdout] fce0a6c1a431335fe740ab6f2d4ef2fab222a7c63b02b6de945aee4b6f5f3fd0