[INFO] fetching crate glsp-proc-macros 0.2.0...
[INFO] testing glsp-proc-macros-0.2.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate glsp-proc-macros 0.2.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate glsp-proc-macros 0.2.0 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate glsp-proc-macros 0.2.0
[INFO] finished tweaking crates.io crate glsp-proc-macros 0.2.0
[INFO] tweaked toml for crates.io crate glsp-proc-macros 0.2.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b0c75ae1634559cff0848fb113350a897498510d374fc9775185d3b760f2718
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3b0c75ae1634559cff0848fb113350a897498510d374fc9775185d3b760f2718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b0c75ae1634559cff0848fb113350a897498510d374fc9775185d3b760f2718", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b0c75ae1634559cff0848fb113350a897498510d374fc9775185d3b760f2718", kill_on_drop: false }`
[INFO] [stdout] 3b0c75ae1634559cff0848fb113350a897498510d374fc9775185d3b760f2718
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1f4870946e1ab1f13d274530c07275c0b14e6a808c958a0eb17685cb9f58cfcd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1f4870946e1ab1f13d274530c07275c0b14e6a808c958a0eb17685cb9f58cfcd", kill_on_drop: false }`
[INFO] [stderr]    Compiling smallvec v1.6.0
[INFO] [stderr]    Compiling glsp-engine v0.2.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(min_specialization)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(rustc_attrs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(unboxed_closures)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:1003:15
[INFO] [stdout]      |
[INFO] [stdout] 1003 | impl<T, const N: usize> IntoVal for [T; N] where for<'a> &'a T: IntoVal {
[INFO] [stdout]      |               ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:1010:19
[INFO] [stdout]      |
[INFO] [stdout] 1010 | impl<'a, T, const N: usize> IntoVal for &'a [T; N] where &'a T: IntoVal {
[INFO] [stdout]      |                   ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:1017:19
[INFO] [stdout]      |
[INFO] [stdout] 1017 | impl<'a, T, const N: usize> IntoVal for &'a mut [T; N] where &'a mut T: IntoVal {
[INFO] [stdout]      |                   ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:1774:24
[INFO] [stdout]      |
[INFO] [stdout] 1774 | impl<T: FromVal, const N: usize> FromVal for [T; N] {
[INFO] [stdout]      |                        ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:2972:16
[INFO] [stdout]      |
[INFO] [stdout] 2972 |     impl<T, const N: usize> Sealed for [T; N] where for<'a> &'a T: IntoVal { }
[INFO] [stdout]      |                   ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:2973:20
[INFO] [stdout]      |
[INFO] [stdout] 2973 |     impl<'a, T, const N: usize> Sealed for &'a [T; N] where &'a T: IntoVal { }
[INFO] [stdout]      |                       ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:2974:20
[INFO] [stdout]      |
[INFO] [stdout] 2974 |     impl<'a, T, const N: usize> Sealed for &'a mut [T; N] where &'a mut T: IntoVal { }
[INFO] [stdout]      |                       ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:3029:15
[INFO] [stdout]      |
[INFO] [stdout] 3029 | impl<T, const N: usize> IntoCallArgs for [T; N] where for<'a> &'a T: IntoVal {
[INFO] [stdout]      |               ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:3039:19
[INFO] [stdout]      |
[INFO] [stdout] 3039 | impl<'a, T, const N: usize> IntoCallArgs for &'a [T; N] where &'a T: IntoVal {
[INFO] [stdout]      |                   ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: const generics are unstable
[INFO] [stdout]     --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/glsp-engine-0.2.0/src/wrap.rs:3049:19
[INFO] [stdout]      |
[INFO] [stdout] 3049 | impl<'a, T, const N: usize> IntoCallArgs for &'a mut [T; N] where &'a mut T: IntoVal {
[INFO] [stdout]      |                   ^
[INFO] [stdout]      |
[INFO] [stdout]      = note: see issue #74878 <https://github.com/rust-lang/rust/issues/74878> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 13 previous errors
[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 `glsp-engine`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "1f4870946e1ab1f13d274530c07275c0b14e6a808c958a0eb17685cb9f58cfcd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f4870946e1ab1f13d274530c07275c0b14e6a808c958a0eb17685cb9f58cfcd", kill_on_drop: false }`
[INFO] [stdout] 1f4870946e1ab1f13d274530c07275c0b14e6a808c958a0eb17685cb9f58cfcd