[INFO] fetching crate nb-sync 0.2.0...
[INFO] testing nb-sync-0.2.0 against 1.44.0 for beta-1.45-1
[INFO] extracting crate nb-sync 0.2.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate nb-sync 0.2.0 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate nb-sync 0.2.0
[INFO] finished tweaking crates.io crate nb-sync 0.2.0
[INFO] tweaked toml for crates.io crate nb-sync 0.2.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 49a6b3d0894552610e13689f52a4ad2ce9b3be700d96190ae1aa293c8c0b940a
[INFO] running `"docker" "start" "-a" "49a6b3d0894552610e13689f52a4ad2ce9b3be700d96190ae1aa293c8c0b940a"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling nb v0.1.2
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling nb-sync v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:134:1
[INFO] [stderr]     |
[INFO] [stderr] 134 | #![feature(const_fn)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:135:1
[INFO] [stderr]     |
[INFO] [stderr] 135 | #![feature(optin_builtin_traits)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:136:1
[INFO] [stderr]     |
[INFO] [stderr] 136 | #![feature(never_type)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stderr]    --> src/fifo.rs:205:25
[INFO] [stderr]     |
[INFO] [stderr] 205 | impl<'a, 'b: 'a, T: 'b> !Sync for Receiver<'a, 'b, T> {
[INFO] [stderr]     |                         ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: negative trait bounds are not yet fully implemented; use marker types for now
[INFO] [stderr]    --> src/fifo.rs:264:25
[INFO] [stderr]     |
[INFO] [stderr] 264 | impl<'a, 'b: 'a, T: 'b> !Sync for Sender<'a, 'b, T> {
[INFO] [stderr]     |                         ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/fifo.rs:83:30
[INFO] [stderr]    |
[INFO] [stderr] 83 |     pub fn recv(&self, _nr: &NonReentrant) -> nb::Result<T, !> {
[INFO] [stderr]    |                              ^^^^^^^^^^^^ help: use `dyn`: `dyn NonReentrant`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/fifo.rs:117:39
[INFO] [stderr]     |
[INFO] [stderr] 117 |     pub fn send(&self, value: T, nr: &NonReentrant) -> nb::Result<(), !> {
[INFO] [stderr]     |                                       ^^^^^^^^^^^^ help: use `dyn`: `dyn NonReentrant`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/fifo.rs:127:49
[INFO] [stderr]     |
[INFO] [stderr] 127 |     pub fn send_lossless(&self, value: T, _nr: &NonReentrant) -> (nb::Result<(), !>, Option<T>) {
[INFO] [stderr]     |                                                 ^^^^^^^^^^^^ help: use `dyn`: `dyn NonReentrant`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors; 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `nb-sync`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "49a6b3d0894552610e13689f52a4ad2ce9b3be700d96190ae1aa293c8c0b940a"`
[INFO] running `"docker" "rm" "-f" "49a6b3d0894552610e13689f52a4ad2ce9b3be700d96190ae1aa293c8c0b940a"`
[INFO] [stdout] 49a6b3d0894552610e13689f52a4ad2ce9b3be700d96190ae1aa293c8c0b940a