[INFO] cloning repository https://github.com/yuk1ty/rusty-monad
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yuk1ty/rusty-monad" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuk1ty%2Frusty-monad", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuk1ty%2Frusty-monad'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 279a33f8d8a843e76ef4d7e62f35813909bba26a
[INFO] testing yuk1ty/rusty-monad against 1.49.0 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuk1ty%2Frusty-monad" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yuk1ty/rusty-monad 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 git repo https://github.com/yuk1ty/rusty-monad
[INFO] finished tweaking git repo https://github.com/yuk1ty/rusty-monad
[INFO] tweaked toml for git repo https://github.com/yuk1ty/rusty-monad written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/yuk1ty/rusty-monad already has a lockfile, it will not be regenerated
[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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 80265a3d76f3131c9bfae1e3e98d637477c60a43b0f8187031d305a3201ef875
[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" "80265a3d76f3131c9bfae1e3e98d637477c60a43b0f8187031d305a3201ef875", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "80265a3d76f3131c9bfae1e3e98d637477c60a43b0f8187031d305a3201ef875", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80265a3d76f3131c9bfae1e3e98d637477c60a43b0f8187031d305a3201ef875", kill_on_drop: false }`
[INFO] [stdout] 80265a3d76f3131c9bfae1e3e98d637477c60a43b0f8187031d305a3201ef875
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 769c0e14f9db0ae0b4acc3a82a2c4789aa51b5176354b15dd19d6de1d902897e
[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" "769c0e14f9db0ae0b4acc3a82a2c4789aa51b5176354b15dd19d6de1d902897e", kill_on_drop: false }`
[INFO] [stderr]    Compiling rusty-monad v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(generic_associated_types)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `applicative::Applicative`, `functor::Functor`, `functor::Pointed`, `monad::Monad`
[INFO] [stdout]  --> src/data/list.rs:1:13
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::{applicative::Applicative, functor::Functor, functor::Pointed, monad::Monad};
[INFO] [stdout]   |             ^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused macro definition
[INFO] [stdout]   --> src/lib.rs:9:1
[INFO] [stdout]    |
[INFO] [stdout] 9  | / macro_rules! mdo {
[INFO] [stdout] 10 | |     ($i:ident <- $e:expr; $($t:tt)*) => {
[INFO] [stdout] 11 | |         $e.bind(move |$i| mdo!($($t)*))
[INFO] [stdout] 12 | |     };
[INFO] [stdout] ...  |
[INFO] [stdout] 18 | |     };
[INFO] [stdout] 19 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_macros)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::data::option::*`
[INFO] [stdout]   --> src/lib.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     use crate::data::option::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `applicative::Applicative`, `functor::Functor`, `functor::Pointed`, `monad::Monad`
[INFO] [stdout]   --> src/lib.rs:23:17
[INFO] [stdout]    |
[INFO] [stdout] 23 |     use crate::{applicative::Applicative, functor::Functor, functor::Pointed, monad::Monad};
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rusty-monad`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "769c0e14f9db0ae0b4acc3a82a2c4789aa51b5176354b15dd19d6de1d902897e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "769c0e14f9db0ae0b4acc3a82a2c4789aa51b5176354b15dd19d6de1d902897e", kill_on_drop: false }`
[INFO] [stdout] 769c0e14f9db0ae0b4acc3a82a2c4789aa51b5176354b15dd19d6de1d902897e