[INFO] crate hamt-sync 0.2.5 is already in cache
[INFO] testing hamt-sync-0.2.5 against 1.38.0 for beta-1.39-1
[INFO] extracting crate hamt-sync 0.2.5 into work/builds/worker-3/source
[INFO] validating manifest of crates.io crate hamt-sync 0.2.5 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 crates.io crate hamt-sync 0.2.5
[INFO] finished tweaking crates.io crate hamt-sync 0.2.5
[INFO] tweaked toml for crates.io crate hamt-sync 0.2.5 written to work/builds/worker-3/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/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] d18697a135294da984d0b1ea7fd5e82f362868ca8ee0f373e1f5d69e45aae5f5
[INFO] running `"docker" "start" "-a" "d18697a135294da984d0b1ea7fd5e82f362868ca8ee0f373e1f5d69e45aae5f5"`
[INFO] [stderr]    Compiling hamt-sync v0.2.5 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[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 `hamt-sync`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d18697a135294da984d0b1ea7fd5e82f362868ca8ee0f373e1f5d69e45aae5f5"`
[INFO] running `"docker" "rm" "-f" "d18697a135294da984d0b1ea7fd5e82f362868ca8ee0f373e1f5d69e45aae5f5"`
[INFO] [stdout] d18697a135294da984d0b1ea7fd5e82f362868ca8ee0f373e1f5d69e45aae5f5