[INFO] updating cached repository jkcclemens/mod_mail
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jkcclemens/mod_mail
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jkcclemens/mod_mail" "work/ex/beta-1.37-6/sources/1.36.0/gh/jkcclemens/mod_mail"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/jkcclemens/mod_mail'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jkcclemens/mod_mail" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/jkcclemens/mod_mail"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/jkcclemens/mod_mail'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6e69637a223687600d01c9a67af90bb9faa9a120
[INFO] sha for GitHub repo jkcclemens/mod_mail: 6e69637a223687600d01c9a67af90bb9faa9a120
[INFO] validating manifest of jkcclemens/mod_mail 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 jkcclemens/mod_mail 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 jkcclemens/mod_mail
[INFO] finished frobbing jkcclemens/mod_mail
[INFO] frobbed toml for jkcclemens/mod_mail written to work/ex/beta-1.37-6/sources/1.36.0/gh/jkcclemens/mod_mail/Cargo.toml
[INFO] started frobbing jkcclemens/mod_mail
[INFO] finished frobbing jkcclemens/mod_mail
[INFO] frobbed toml for jkcclemens/mod_mail written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/jkcclemens/mod_mail/Cargo.toml
[INFO] crate jkcclemens/mod_mail 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 jkcclemens/mod_mail 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-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/jkcclemens/mod_mail:/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] 7d065d6872b37125024ccf0bd62f16f7757ead1b967a343355c841484ba34b29
[INFO] running `"docker" "start" "-a" "7d065d6872b37125024ccf0bd62f16f7757ead1b967a343355c841484ba34b29"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]    Compiling socket2 v0.3.8
[INFO] [stderr]    Compiling base64 v0.8.0
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling diesel v1.3.3
[INFO] [stderr]    Compiling postgres-protocol v0.3.2
[INFO] [stderr]    Compiling hyper-native-tls v0.2.4
[INFO] [stderr]    Compiling failure v0.1.2
[INFO] [stderr]    Compiling mime_guess v1.8.6
[INFO] [stderr]    Compiling dotenv v0.13.0
[INFO] [stderr]    Compiling evzht9h3nznqzwl v0.0.3
[INFO] [stderr]    Compiling postgres-shared v0.4.2
[INFO] [stderr]    Compiling flate2 v1.0.3
[INFO] [stderr]    Compiling multipart v0.13.6
[INFO] [stderr]    Compiling serenity v0.5.9
[INFO] [stderr]    Compiling postgres v0.15.2
[INFO] [stderr]    Compiling r2d2-diesel v1.0.0
[INFO] [stderr]    Compiling mod_mail v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(box_syntax)]
[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 `mod_mail`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7d065d6872b37125024ccf0bd62f16f7757ead1b967a343355c841484ba34b29"`
[INFO] running `"docker" "rm" "-f" "7d065d6872b37125024ccf0bd62f16f7757ead1b967a343355c841484ba34b29"`
[INFO] [stdout] 7d065d6872b37125024ccf0bd62f16f7757ead1b967a343355c841484ba34b29