[INFO] crate mumble-protocol 0.2.0 is already in cache
[INFO] testing mumble-protocol-0.2.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate mumble-protocol 0.2.0 into work/builds/worker-2/source
[INFO] validating manifest of crates.io crate mumble-protocol 0.2.0 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate mumble-protocol 0.2.0
[INFO] finished tweaking crates.io crate mumble-protocol 0.2.0
[INFO] tweaked toml for crates.io crate mumble-protocol 0.2.0 written to work/builds/worker-2/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 5fb3ff78f6786b9461d95c01f000aade741b7be9f2cc7631228b6cb10cdda98a
[INFO] running `"docker" "start" "-a" "5fb3ff78f6786b9461d95c01f000aade741b7be9f2cc7631228b6cb10cdda98a"`
[INFO] [stderr]    Compiling protobuf-codegen v2.8.1
[INFO] [stderr]    Compiling protobuf-codegen-pure v2.8.1
[INFO] [stderr]    Compiling mumble-protocol v0.2.0 (/opt/rustwide/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 11.06s
[INFO] running `"docker" "inspect" "5fb3ff78f6786b9461d95c01f000aade741b7be9f2cc7631228b6cb10cdda98a"`
[INFO] running `"docker" "rm" "-f" "5fb3ff78f6786b9461d95c01f000aade741b7be9f2cc7631228b6cb10cdda98a"`
[INFO] [stdout] 5fb3ff78f6786b9461d95c01f000aade741b7be9f2cc7631228b6cb10cdda98a
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 104ff685dd5f20a09143381f21301c98073d7d565e7bf861cd522902f9546256
[INFO] running `"docker" "start" "-a" "104ff685dd5f20a09143381f21301c98073d7d565e7bf861cd522902f9546256"`
[INFO] [stderr]    Compiling tokio-tls v0.2.1
[INFO] [stderr]    Compiling mumble-protocol v0.2.0 (/opt/rustwide/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] error[E0554]: `#![feature]` may not be used on the stable 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] error: build failed
[INFO] running `"docker" "inspect" "104ff685dd5f20a09143381f21301c98073d7d565e7bf861cd522902f9546256"`
[INFO] running `"docker" "rm" "-f" "104ff685dd5f20a09143381f21301c98073d7d565e7bf861cd522902f9546256"`
[INFO] [stdout] 104ff685dd5f20a09143381f21301c98073d7d565e7bf861cd522902f9546256