[INFO] updating cached repository mgsloan/treadcam
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mgsloan/treadcam
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mgsloan/treadcam" "work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/treadcam"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/treadcam'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mgsloan/treadcam" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mgsloan/treadcam"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mgsloan/treadcam'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a7394173dbc9e81874d897e2e382f0ea38784b20
[INFO] sha for GitHub repo mgsloan/treadcam: a7394173dbc9e81874d897e2e382f0ea38784b20
[INFO] validating manifest of mgsloan/treadcam 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 mgsloan/treadcam 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 mgsloan/treadcam
[INFO] finished frobbing mgsloan/treadcam
[INFO] frobbed toml for mgsloan/treadcam written to work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/treadcam/Cargo.toml
[INFO] started frobbing mgsloan/treadcam
[INFO] finished frobbing mgsloan/treadcam
[INFO] frobbed toml for mgsloan/treadcam written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mgsloan/treadcam/Cargo.toml
[INFO] crate mgsloan/treadcam 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 mgsloan/treadcam 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/mgsloan/treadcam:/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] f6ebc5c02896d57199dde38be20b50333dc106eaf0f1aae8d3f2da73c0c08316
[INFO] running `"docker" "start" "-a" "f6ebc5c02896d57199dde38be20b50333dc106eaf0f1aae8d3f2da73c0c08316"`
[INFO] [stderr]    Compiling goertzel v0.2.0
[INFO] [stderr]    Compiling rscam v0.5.4
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling rustfft v2.0.0
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling image v0.17.0
[INFO] [stderr]    Compiling treadcam 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(type_ascription)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rustfft::FFTplanner`
[INFO] [stderr]   --> src/main.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use rustfft::FFTplanner;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rustfft::num_complex::Complex`
[INFO] [stderr]   --> src/main.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | use rustfft::num_complex::Complex;
[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 `treadcam`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f6ebc5c02896d57199dde38be20b50333dc106eaf0f1aae8d3f2da73c0c08316"`
[INFO] running `"docker" "rm" "-f" "f6ebc5c02896d57199dde38be20b50333dc106eaf0f1aae8d3f2da73c0c08316"`
[INFO] [stdout] f6ebc5c02896d57199dde38be20b50333dc106eaf0f1aae8d3f2da73c0c08316