[INFO] updating cached repository https://github.com/SirVer/giti
[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] 4cdd2d4d21b041d0b9ad0c374bf0dd88c36df662
[INFO] testing SirVer/giti against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FSirVer%2Fgiti" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SirVer/giti 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/SirVer/giti
[INFO] finished tweaking git repo https://github.com/SirVer/giti
[INFO] tweaked toml for git repo https://github.com/SirVer/giti written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/SirVer/giti 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] running `"docker" "create" "-v" "/big/crater/work/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] cc52d1965f53def219c5f00727a1a5c164131f442c39afc53c942f56478f23e3
[INFO] running `"docker" "start" "-a" "cc52d1965f53def219c5f00727a1a5c164131f442c39afc53c942f56478f23e3"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling futures v0.1.25
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling rle-decode-fast v1.0.1
[INFO] [stderr]    Compiling webbrowser v0.3.1
[INFO] [stderr]    Compiling default-editor v0.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.6.2
[INFO] [stderr]    Compiling curl-sys v0.4.15
[INFO] [stderr]    Compiling miniz-sys v0.1.11
[INFO] [stderr]    Compiling getopts v0.2.19
[INFO] [stderr]    Compiling filetime v0.2.4
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling pbr v1.0.1
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling regex v1.1.6
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling serde_derive v1.0.81
[INFO] [stderr]    Compiling error-chain v0.12.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/futures-0.1.25/src/lib.rs:161:34
[INFO] [stderr]     |
[INFO] [stderr] 161 | #![cfg_attr(feature = "nightly", feature(pin))]
[INFO] [stderr]     |                                  ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling hyper-old-types v0.11.0
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling hyperx v0.13.1
[INFO] [stderr]    Compiling libflate v0.1.26
[INFO] [stderr]    Compiling libssh2-sys v0.2.11
[INFO] [stderr]    Compiling crossbeam-epoch v0.6.1
[INFO] [stderr]    Compiling tar v0.4.20
[INFO] [stderr]    Compiling tempfile v3.0.7
[INFO] [stderr]    Compiling parking_lot v0.6.4
[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] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "cc52d1965f53def219c5f00727a1a5c164131f442c39afc53c942f56478f23e3"`
[INFO] running `"docker" "rm" "-f" "cc52d1965f53def219c5f00727a1a5c164131f442c39afc53c942f56478f23e3"`
[INFO] [stdout] cc52d1965f53def219c5f00727a1a5c164131f442c39afc53c942f56478f23e3