[INFO] fetching crate viro 1.0.2...
[INFO] testing viro-1.0.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate viro 1.0.2 into /workspace/builds/worker-84/source
[INFO] validating manifest of crates.io crate viro 1.0.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate viro 1.0.2
[INFO] finished tweaking crates.io crate viro 1.0.2
[INFO] tweaked toml for crates.io crate viro 1.0.2 written to /workspace/builds/worker-84/source/Cargo.toml
[INFO] crate crates.io crate viro 1.0.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded phf_generator v0.10.0
[INFO] [stderr]   Downloaded phf_shared v0.10.0
[INFO] [stderr]   Downloaded phf v0.10.0
[INFO] [stderr]   Downloaded phf_macros v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 850724f70f3252515757d3e5cb56f66ec659838a199fce7550977aa0531c92c6
[INFO] running `Command { std: "docker" "start" "-a" "850724f70f3252515757d3e5cb56f66ec659838a199fce7550977aa0531c92c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "850724f70f3252515757d3e5cb56f66ec659838a199fce7550977aa0531c92c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "850724f70f3252515757d3e5cb56f66ec659838a199fce7550977aa0531c92c6", kill_on_drop: false }`
[INFO] [stdout] 850724f70f3252515757d3e5cb56f66ec659838a199fce7550977aa0531c92c6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-84/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25230e548c180f33e5eaf12c44eb3a0def6b0f3c7348081980be85e46234970c
[INFO] running `Command { std: "docker" "start" "-a" "25230e548c180f33e5eaf12c44eb3a0def6b0f3c7348081980be85e46234970c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling siphasher v0.3.7
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling regex-automata v0.1.10
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling phf_shared v0.10.0
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling phf_generator v0.10.0
[INFO] [stderr]    Compiling phf_macros v0.10.0
[INFO] [stderr]    Compiling phf v0.10.0
[INFO] [stderr]    Compiling viro v1.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(doc_cfg, try_trait_v2, type_alias_impl_trait)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `impl Trait` in type aliases is unstable
[INFO] [stdout]    --> src/lib.rs:687:25
[INFO] [stdout]     |
[INFO] [stdout] 687 | type DelimAfterFn<'a> = impl FnMut(&'a BString) -> array::IntoIter<&'a [u8], 2>;
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: `impl Trait` in type aliases is unstable
[INFO] [stdout]    --> src/lib.rs:695:26
[INFO] [stdout]     |
[INFO] [stdout] 695 | type DelimBeforeFn<'a> = impl FnMut(&'a BString) -> array::IntoIter<&'a [u8], 2>;
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `type_alias_impl_trait` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]   --> src/lib.rs:10:35
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(doc_cfg, try_trait_v2, type_alias_impl_trait)]
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]    = note: see issue #63063 <https://github.com/rust-lang/rust/issues/63063> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `viro` due to 4 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "25230e548c180f33e5eaf12c44eb3a0def6b0f3c7348081980be85e46234970c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25230e548c180f33e5eaf12c44eb3a0def6b0f3c7348081980be85e46234970c", kill_on_drop: false }`
[INFO] [stdout] 25230e548c180f33e5eaf12c44eb3a0def6b0f3c7348081980be85e46234970c