[INFO] crate ocf 0.2.0-alpha.6 is already in cache
[INFO] extracting crate ocf 0.2.0-alpha.6 into work/ex/beta-1.37-6/sources/1.36.0/reg/ocf/0.2.0-alpha.6
[INFO] extracting crate ocf 0.2.0-alpha.6 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ocf/0.2.0-alpha.6
[INFO] validating manifest of ocf-0.2.0-alpha.6 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 ocf-0.2.0-alpha.6 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 ocf-0.2.0-alpha.6
[INFO] finished frobbing ocf-0.2.0-alpha.6
[INFO] frobbed toml for ocf-0.2.0-alpha.6 written to work/ex/beta-1.37-6/sources/1.36.0/reg/ocf/0.2.0-alpha.6/Cargo.toml
[INFO] started frobbing ocf-0.2.0-alpha.6
[INFO] finished frobbing ocf-0.2.0-alpha.6
[INFO] frobbed toml for ocf-0.2.0-alpha.6 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/ocf/0.2.0-alpha.6/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 ocf-0.2.0-alpha.6 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/ocf/0.2.0-alpha.6:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 021ee4dccb83df49fbcde530ca9ce090c25aa5e271ce138bb540e9da61bbe86f
[INFO] running `"docker" "start" "-a" "021ee4dccb83df49fbcde530ca9ce090c25aa5e271ce138bb540e9da61bbe86f"`
[INFO] [stderr]    Compiling serde v0.7.15
[INFO] [stderr]    Compiling ocf v0.2.0-alpha.6 (/opt/crater/workdir)
[INFO] [stderr]    Compiling ordered-float v0.0.2
[INFO] [stderr]    Compiling serde_json v0.7.4
[INFO] [stderr]    Compiling serde-value v0.1.0
[INFO] [stderr] error: cannot find macro `error_expected_unstable_or_stable_feature!` in this scope
[INFO] [stderr]   --> src/mod.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | error_expected_unstable_or_stable_feature!();
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `ocf`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "021ee4dccb83df49fbcde530ca9ce090c25aa5e271ce138bb540e9da61bbe86f"`
[INFO] running `"docker" "rm" "-f" "021ee4dccb83df49fbcde530ca9ce090c25aa5e271ce138bb540e9da61bbe86f"`
[INFO] [stdout] 021ee4dccb83df49fbcde530ca9ce090c25aa5e271ce138bb540e9da61bbe86f