[INFO] fetching crate validators 0.20.12...
[INFO] extracting crate validators 0.20.12 into work/ex/beta-1.37-6/sources/1.36.0/reg/validators/0.20.12
[INFO] extracting crate validators 0.20.12 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/validators/0.20.12
[INFO] validating manifest of validators-0.20.12 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 validators-0.20.12 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 validators-0.20.12
[INFO] finished frobbing validators-0.20.12
[INFO] frobbed toml for validators-0.20.12 written to work/ex/beta-1.37-6/sources/1.36.0/reg/validators/0.20.12/Cargo.toml
[INFO] started frobbing validators-0.20.12
[INFO] finished frobbing validators-0.20.12
[INFO] frobbed toml for validators-0.20.12 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/validators/0.20.12/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing validators-0.20.12 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-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/validators/0.20.12:/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] dc0de32fa8cf98ecd3dfb8b1f19f6fb223653cd263eddd42a3535e59eb049c65
[INFO] running `"docker" "start" "-a" "dc0de32fa8cf98ecd3dfb8b1f19f6fb223653cd263eddd42a3535e59eb049c65"`
[INFO] [stderr] warning: version requirement `0.2.3+8.10.6` for dependency `phonenumber` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
[INFO] [stderr]    Compiling validators v0.20.12 (/opt/crater/workdir)
[INFO] [stderr] error: enum variants on type aliases are experimental
[INFO] [stderr]    --> src/host/mod.rs:103:9
[INFO] [stderr]     |
[INFO] [stderr] 103 |         impl_debug_for_enum!(Host::{(Domain(v): (let .v = v)), (IPv4(v): (let .v = v)), (IPv6(v): (let .v = v))}, f, self);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `validators`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "dc0de32fa8cf98ecd3dfb8b1f19f6fb223653cd263eddd42a3535e59eb049c65"`
[INFO] running `"docker" "rm" "-f" "dc0de32fa8cf98ecd3dfb8b1f19f6fb223653cd263eddd42a3535e59eb049c65"`
[INFO] [stdout] dc0de32fa8cf98ecd3dfb8b1f19f6fb223653cd263eddd42a3535e59eb049c65