[INFO] cloning repository VictorKoenders/rust_neural_network
[INFO] running `"git" "clone" "--bare" "git://github.com/VictorKoenders/rust_neural_network.git" "work/cache/sources/gh/VictorKoenders/rust_neural_network"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/VictorKoenders/rust_neural_network'...
[INFO] running `"git" "clone" "work/cache/sources/gh/VictorKoenders/rust_neural_network" "work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/VictorKoenders/rust_neural_network"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/VictorKoenders/rust_neural_network'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/VictorKoenders/rust_neural_network" "work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/VictorKoenders/rust_neural_network"`
[INFO] [stderr] Cloning into 'work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/VictorKoenders/rust_neural_network'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 249a720c2e11040f4f0abb4d85041afea07bc9bd
[INFO] sha for GitHub repo VictorKoenders/rust_neural_network: 249a720c2e11040f4f0abb4d85041afea07bc9bd
[INFO] validating manifest of VictorKoenders/rust_neural_network on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of VictorKoenders/rust_neural_network on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing VictorKoenders/rust_neural_network
[INFO] finished frobbing VictorKoenders/rust_neural_network
[INFO] frobbed toml for VictorKoenders/rust_neural_network written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/gh/VictorKoenders/rust_neural_network/Cargo.toml
[INFO] started frobbing VictorKoenders/rust_neural_network
[INFO] finished frobbing VictorKoenders/rust_neural_network
[INFO] frobbed toml for VictorKoenders/rust_neural_network written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/VictorKoenders/rust_neural_network/Cargo.toml
[INFO] crate VictorKoenders/rust_neural_network already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking VictorKoenders/rust_neural_network against try#d3301713b54af69ca9de941a8c6b0d8287dbd6df for pr-61874
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61874/worker-5/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/gh/VictorKoenders/rust_neural_network:/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=forbid" "-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" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 313b63469b013e4be5ae8d111ca71b6b20ee25642b4e18668141b1287be9ffe5
[INFO] running `"docker" "start" "-a" "313b63469b013e4be5ae8d111ca71b6b20ee25642b4e18668141b1287be9ffe5"`
[INFO] [stderr]     Checking itertools v0.6.0
[INFO] [stderr]     Checking sdl2 v0.30.0
[INFO] [stderr]     Checking rust_nn v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0635]: unknown feature `step_by`
[INFO] [stderr]  --> src/lib.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(step_by)]
[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 E0635`.
[INFO] [stderr] error: Could not compile `rust_nn`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0635]: unknown feature `step_by`
[INFO] [stderr]  --> src/lib.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(step_by)]
[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 E0635`.
[INFO] [stderr] error: Could not compile `rust_nn`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "313b63469b013e4be5ae8d111ca71b6b20ee25642b4e18668141b1287be9ffe5"`
[INFO] running `"docker" "rm" "-f" "313b63469b013e4be5ae8d111ca71b6b20ee25642b4e18668141b1287be9ffe5"`
[INFO] [stdout] 313b63469b013e4be5ae8d111ca71b6b20ee25642b4e18668141b1287be9ffe5