[INFO] crate xmpp 0.2.0 is already in cache
[INFO] extracting crate xmpp 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/xmpp/0.2.0
[INFO] extracting crate xmpp 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/xmpp/0.2.0
[INFO] validating manifest of xmpp-0.2.0 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 xmpp-0.2.0 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 xmpp-0.2.0
[INFO] finished frobbing xmpp-0.2.0
[INFO] frobbed toml for xmpp-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/xmpp/0.2.0/Cargo.toml
[INFO] started frobbing xmpp-0.2.0
[INFO] finished frobbing xmpp-0.2.0
[INFO] frobbed toml for xmpp-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/xmpp/0.2.0/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 xmpp-0.2.0 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-5/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/xmpp/0.2.0:/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] 12bf0e21823c7f62ab9a1f998e9340821bef9228c99becad0d082222d0b69cd5
[INFO] running `"docker" "start" "-a" "12bf0e21823c7f62ab9a1f998e9340821bef9228c99becad0d082222d0b69cd5"`
[INFO] [stderr]    Compiling jid v0.2.3
[INFO] [stderr]    Compiling xml-rs v0.4.1
[INFO] [stderr]    Compiling generic-array v0.7.3
[INFO] [stderr]    Compiling pbkdf2 v0.3.0
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling crypto-mac v0.3.0
[INFO] [stderr]    Compiling digest v0.5.2
[INFO] [stderr]    Compiling digest-buffer v0.3.1
[INFO] [stderr]    Compiling blake2 v0.5.2
[INFO] [stderr]    Compiling sha2 v0.5.3
[INFO] [stderr]    Compiling sha3 v0.5.3
[INFO] [stderr]    Compiling sha-1 v0.3.4
[INFO] [stderr]    Compiling sasl v0.4.3
[INFO] [stderr]    Compiling minidom v0.4.4
[INFO] [stderr]    Compiling xmpp-parsers v0.3.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/xmpp-parsers-0.3.0/src/lib.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(try_from)]
[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 `xmpp-parsers`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "12bf0e21823c7f62ab9a1f998e9340821bef9228c99becad0d082222d0b69cd5"`
[INFO] running `"docker" "rm" "-f" "12bf0e21823c7f62ab9a1f998e9340821bef9228c99becad0d082222d0b69cd5"`
[INFO] [stdout] 12bf0e21823c7f62ab9a1f998e9340821bef9228c99becad0d082222d0b69cd5