[INFO] cloning repository https://github.com/bsg/ringbuf-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bsg/ringbuf-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbsg%2Fringbuf-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbsg%2Fringbuf-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f22385eb1476ea87c0f63b3226dccb4ca85578de
[INFO] checking bsg/ringbuf-rs against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbsg%2Fringbuf-rs" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/bsg/ringbuf-rs
[INFO] finished tweaking git repo https://github.com/bsg/ringbuf-rs
[INFO] tweaked toml for git repo https://github.com/bsg/ringbuf-rs written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/bsg/ringbuf-rs on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/bsg/ringbuf-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2c5df0b5126b1064e2f7076fc925aec85eddd7b52bf04a3d1a81f96f6da3770
[INFO] running `Command { std: "docker" "start" "-a" "b2c5df0b5126b1064e2f7076fc925aec85eddd7b52bf04a3d1a81f96f6da3770", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2c5df0b5126b1064e2f7076fc925aec85eddd7b52bf04a3d1a81f96f6da3770", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2c5df0b5126b1064e2f7076fc925aec85eddd7b52bf04a3d1a81f96f6da3770", kill_on_drop: false }`
[INFO] [stdout] b2c5df0b5126b1064e2f7076fc925aec85eddd7b52bf04a3d1a81f96f6da3770
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a89d62f79c86e935696fa5839c7887da4ca0d3e8ccb7bdffea66f64c4cce252f
[INFO] running `Command { std: "docker" "start" "-a" "a89d62f79c86e935696fa5839c7887da4ca0d3e8ccb7bdffea66f64c4cce252f", kill_on_drop: false }`
[INFO] [stderr]     Checking ringbuf v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         assert_matches!(buf.write(&42u32.to_le_bytes()), Ok(_));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |         assert_matches!(buf.write(&42u8.to_le_bytes()), Ok(_));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         assert_matches!(buf.write(&42u64.to_le_bytes()), Ok(_));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |         assert_matches!(buf.read(&mut bytes), Ok(_));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         assert_matches!(buf.read(&mut bytes), Ok(_));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |         assert_matches!(buf.read(&mut bytes), Ok(_));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]   --> src/tests.rs:25:9
[INFO] [stdout]    |
[INFO] [stdout] 25 |         assert_matches!(buf.read(&mut bytes), Ok(0));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `assert_matches`
[INFO] [stdout]  --> src/tests.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     assert_matches,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #82775 <https://github.com/rust-lang/rust/issues/82775> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ringbuf` (lib test) due to 8 previous errors
[INFO] running `Command { std: "docker" "inspect" "a89d62f79c86e935696fa5839c7887da4ca0d3e8ccb7bdffea66f64c4cce252f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a89d62f79c86e935696fa5839c7887da4ca0d3e8ccb7bdffea66f64c4cce252f", kill_on_drop: false }`
[INFO] [stdout] a89d62f79c86e935696fa5839c7887da4ca0d3e8ccb7bdffea66f64c4cce252f
