[INFO] updating cached repository https://github.com/alanwilhelm/starling-genesis
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 39c845b4b014123b1473ee6bc3c5188953ade27e
[INFO] testing alanwilhelm/starling-genesis against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Falanwilhelm%2Fstarling-genesis" "work/builds/worker-0/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/alanwilhelm/starling-genesis on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/alanwilhelm/starling-genesis
[INFO] finished tweaking git repo https://github.com/alanwilhelm/starling-genesis
[INFO] tweaked toml for git repo https://github.com/alanwilhelm/starling-genesis written to work/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/alanwilhelm/starling-genesis already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "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 `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 2f4deab4b69949bb336b49e9cb39c58b7c8cbdfc51dd103daa84998c864ccf58
[INFO] running `"docker" "start" "-a" "2f4deab4b69949bb336b49e9cb39c58b7c8cbdfc51dd103daa84998c864ccf58"`
[INFO] [stderr]    Compiling nodrop v0.1.12
[INFO] [stderr]    Compiling memoffset v0.2.1
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling lazy_static v1.0.0
[INFO] [stderr]    Compiling libc v0.2.40
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling gcc v0.3.54
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling crunchy v0.1.6
[INFO] [stderr]    Compiling typenum v1.10.0
[INFO] [stderr]    Compiling byteorder v1.2.3
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling untrusted v0.5.1
[INFO] [stderr]    Compiling lazycell v0.6.0
[INFO] [stderr]    Compiling slab v0.4.0
[INFO] [stderr]    Compiling lazy_static v0.2.11
[INFO] [stderr]    Compiling futures v0.1.21
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling pkg-config v0.3.11
[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 reexport-proc-macro v1.0.2
[INFO] [stderr]    Compiling byteorder v0.4.2
[INFO] [stderr]    Compiling serde v1.0.55
[INFO] [stderr]    Compiling stable_deref_trait v1.0.0
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling unicode-width v0.1.4
[INFO] [stderr]    Compiling enumset v0.3.3
[INFO] [stderr]    Compiling maplit v1.0.1
[INFO] [stderr]    Compiling xi-unicode v0.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling crossbeam-utils v0.3.2
[INFO] [stderr]    Compiling log v0.4.1
[INFO] [stderr]    Compiling proc-macro2 v0.3.8
[INFO] [stderr]    Compiling arrayvec v0.4.7
[INFO] [stderr]    Compiling multibase v0.6.0
[INFO] [stderr]    Compiling owning_ref v0.3.3
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling net2 v0.2.32
[INFO] [stderr]    Compiling time v0.1.40
[INFO] [stderr]    Compiling tiny-keccak v1.4.1
[INFO] [stderr]    Compiling bytes v0.4.7
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.4.1
[INFO] [stderr]    Compiling mio v0.6.14
[INFO] [stderr]    Compiling quote v0.5.2
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling generic-array v0.6.0
[INFO] [stderr]    Compiling syn v0.13.10
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling crossbeam-deque v0.3.1
[INFO] [stderr]    Compiling digest-buffer v0.2.0
[INFO] [stderr]    Compiling digest v0.4.0
[INFO] [stderr]    Compiling sha2 v0.4.2
[INFO] [stderr]    Compiling easy-hash v0.1.0
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling ncurses v5.91.0
[INFO] [stderr]    Compiling tokio-io v0.1.6
[INFO] [stderr]    Compiling tokio-executor v0.1.2
[INFO] [stderr]    Compiling tokio-threadpool v0.1.3
[INFO] [stderr]    Compiling tokio-timer v0.2.3
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling tokio-reactor v0.1.1
[INFO] [stderr]    Compiling tokio-fs v0.1.0
[INFO] [stderr]    Compiling tokio-udp v0.1.0
[INFO] [stderr]    Compiling tokio-tcp v0.1.0
[INFO] [stderr]    Compiling num-bigint v0.1.43
[INFO] [stderr]    Compiling num-complex v0.1.43
[INFO] [stderr]    Compiling tokio v0.1.6
[INFO] [stderr]    Compiling ring v0.12.1
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling num v0.1.42
[INFO] [stderr]    Compiling enum-map-derive v0.2.5
[INFO] [stderr]    Compiling enum-map v0.2.29
[INFO] [stderr]    Compiling toml v0.4.6
[INFO] [stderr]    Compiling multihash v0.7.0
[INFO] [stderr]    Compiling cid v0.2.3
[INFO] [stderr]    Compiling multiaddr v0.3.0
[INFO] [stderr]    Compiling cursive v0.9.0-alpha.0 (https://github.com/gyscos/Cursive#4a3bbbb9)
[INFO] [stderr]    Compiling murmur v0.1.0 (https://github.com/alanwilhelm/murmur#26ad0148)
[INFO] [stderr]    Compiling starling v0.1.0 (/opt/rustwide/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" "2f4deab4b69949bb336b49e9cb39c58b7c8cbdfc51dd103daa84998c864ccf58"`
[INFO] running `"docker" "rm" "-f" "2f4deab4b69949bb336b49e9cb39c58b7c8cbdfc51dd103daa84998c864ccf58"`
[INFO] [stdout] 2f4deab4b69949bb336b49e9cb39c58b7c8cbdfc51dd103daa84998c864ccf58