[INFO] updating cached repository RadicalZephyr/rust-tftp
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/RadicalZephyr/rust-tftp
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/RadicalZephyr/rust-tftp" "work/ex/beta-1.37-6/sources/1.36.0/gh/RadicalZephyr/rust-tftp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/RadicalZephyr/rust-tftp'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/RadicalZephyr/rust-tftp" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/RadicalZephyr/rust-tftp"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/RadicalZephyr/rust-tftp'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3dd90b77d742bc6db997e2c702362baefa98419f
[INFO] sha for GitHub repo RadicalZephyr/rust-tftp: 3dd90b77d742bc6db997e2c702362baefa98419f
[INFO] validating manifest of RadicalZephyr/rust-tftp on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of RadicalZephyr/rust-tftp on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing RadicalZephyr/rust-tftp
[INFO] finished frobbing RadicalZephyr/rust-tftp
[INFO] frobbed toml for RadicalZephyr/rust-tftp written to work/ex/beta-1.37-6/sources/1.36.0/gh/RadicalZephyr/rust-tftp/Cargo.toml
[INFO] started frobbing RadicalZephyr/rust-tftp
[INFO] finished frobbing RadicalZephyr/rust-tftp
[INFO] frobbed toml for RadicalZephyr/rust-tftp written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/RadicalZephyr/rust-tftp/Cargo.toml
[INFO] crate RadicalZephyr/rust-tftp already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing RadicalZephyr/rust-tftp against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/RadicalZephyr/rust-tftp:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] dfa8be76034aa8976e2a998f13c5a2297e768837cfe0f90a546530dd62c2bd19
[INFO] running `"docker" "start" "-a" "dfa8be76034aa8976e2a998f13c5a2297e768837cfe0f90a546530dd62c2bd19"`
[INFO] [stderr]    Compiling futures v0.1.24
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/futures-0.1.24/src/lib.rs:161:34
[INFO] [stderr]     |
[INFO] [stderr] 161 | #![cfg_attr(feature = "nightly", feature(pin))]
[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 `futures`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "dfa8be76034aa8976e2a998f13c5a2297e768837cfe0f90a546530dd62c2bd19"`
[INFO] running `"docker" "rm" "-f" "dfa8be76034aa8976e2a998f13c5a2297e768837cfe0f90a546530dd62c2bd19"`
[INFO] [stdout] dfa8be76034aa8976e2a998f13c5a2297e768837cfe0f90a546530dd62c2bd19