[INFO] crate mumble-protocol 0.2.0 is already in cache
[INFO] extracting crate mumble-protocol 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/mumble-protocol/0.2.0
[INFO] extracting crate mumble-protocol 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mumble-protocol/0.2.0
[INFO] validating manifest of mumble-protocol-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 mumble-protocol-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 mumble-protocol-0.2.0
[INFO] finished frobbing mumble-protocol-0.2.0
[INFO] frobbed toml for mumble-protocol-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/mumble-protocol/0.2.0/Cargo.toml
[INFO] started frobbing mumble-protocol-0.2.0
[INFO] finished frobbing mumble-protocol-0.2.0
[INFO] frobbed toml for mumble-protocol-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mumble-protocol/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 mumble-protocol-0.2.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mumble-protocol/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] d2c752d945eaad08e1611853bc71221de20111b48b8bd5c60a17f31569ff90cf
[INFO] running `"docker" "start" "-a" "d2c752d945eaad08e1611853bc71221de20111b48b8bd5c60a17f31569ff90cf"`
[INFO] [stderr]    Compiling protobuf v2.8.0
[INFO] [stderr]    Compiling protobuf-codegen v2.8.0
[INFO] [stderr]    Compiling protobuf-codegen-pure v2.8.0
[INFO] [stderr]    Compiling mumble-protocol v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: cannot borrow `*buf_mut` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/voice.rs:155:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |         let mut buf = (&*buf_mut).into_buf();
[INFO] [stderr]     |                       ----------- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 155 |                     buf_mut.advance(buf.position() as usize);
[INFO] [stderr]     |                     ^^^^^^^         --- immutable borrow later used here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     mutable borrow occurs here
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(mutable_borrow_reservation_conflict)] on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `*buf_mut` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/voice.rs:181:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |         let mut buf = (&*buf_mut).into_buf();
[INFO] [stderr]     |                       ----------- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 181 |                     buf_mut.advance(buf.position() as usize);
[INFO] [stderr]     |                     ^^^^^^^         --- immutable borrow later used here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     mutable borrow occurs here
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 33.12s
[INFO] running `"docker" "inspect" "d2c752d945eaad08e1611853bc71221de20111b48b8bd5c60a17f31569ff90cf"`
[INFO] running `"docker" "rm" "-f" "d2c752d945eaad08e1611853bc71221de20111b48b8bd5c60a17f31569ff90cf"`
[INFO] [stdout] d2c752d945eaad08e1611853bc71221de20111b48b8bd5c60a17f31569ff90cf
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/mumble-protocol/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 38f68a66bf4ae48ef9c66789d4147933349c3f298a3993f16f463146a0adf864
[INFO] running `"docker" "start" "-a" "38f68a66bf4ae48ef9c66789d4147933349c3f298a3993f16f463146a0adf864"`
[INFO] [stderr]    Compiling tokio-tls v0.2.1
[INFO] [stderr]    Compiling mumble-protocol v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]  --> examples/echo_client.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![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 `mumble-protocol`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: cannot borrow `*buf_mut` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/voice.rs:155:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |         let mut buf = (&*buf_mut).into_buf();
[INFO] [stderr]     |                       ----------- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 155 |                     buf_mut.advance(buf.position() as usize);
[INFO] [stderr]     |                     ^^^^^^^         --- immutable borrow later used here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     mutable borrow occurs here
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(mutable_borrow_reservation_conflict)] on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `*buf_mut` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/voice.rs:181:21
[INFO] [stderr]     |
[INFO] [stderr] 141 |         let mut buf = (&*buf_mut).into_buf();
[INFO] [stderr]     |                       ----------- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 181 |                     buf_mut.advance(buf.position() as usize);
[INFO] [stderr]     |                     ^^^^^^^         --- immutable borrow later used here
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     mutable borrow occurs here
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "38f68a66bf4ae48ef9c66789d4147933349c3f298a3993f16f463146a0adf864"`
[INFO] running `"docker" "rm" "-f" "38f68a66bf4ae48ef9c66789d4147933349c3f298a3993f16f463146a0adf864"`
[INFO] [stdout] 38f68a66bf4ae48ef9c66789d4147933349c3f298a3993f16f463146a0adf864