[INFO] fetching crate simple-async-cache-rs 0.1.2...
[INFO] checking simple-async-cache-rs-0.1.2 against try#3d9fdbff4f377de96b3a51174e7a64086bee9a5c for pr-81477
[INFO] extracting crate simple-async-cache-rs 0.1.2 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate simple-async-cache-rs 0.1.2 on toolchain 3d9fdbff4f377de96b3a51174e7a64086bee9a5c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate simple-async-cache-rs 0.1.2
[INFO] finished tweaking crates.io crate simple-async-cache-rs 0.1.2
[INFO] tweaked toml for crates.io crate simple-async-cache-rs 0.1.2 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate crates.io crate simple-async-cache-rs 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "fetch" "--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a75f6a1c0a9980c287f65cd4289a97a77714f1df6c1d77a03c207a52294a1c39
[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" "a75f6a1c0a9980c287f65cd4289a97a77714f1df6c1d77a03c207a52294a1c39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a75f6a1c0a9980c287f65cd4289a97a77714f1df6c1d77a03c207a52294a1c39", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a75f6a1c0a9980c287f65cd4289a97a77714f1df6c1d77a03c207a52294a1c39", kill_on_drop: false }`
[INFO] [stdout] a75f6a1c0a9980c287f65cd4289a97a77714f1df6c1d77a03c207a52294a1c39
[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=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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+3d9fdbff4f377de96b3a51174e7a64086bee9a5c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e446f899517e18ec8ffef730a3e7ef2fbfb4ae245b2400c8c54f0a9760b93d88
[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" "e446f899517e18ec8ffef730a3e7ef2fbfb4ae245b2400c8c54f0a9760b93d88", kill_on_drop: false }`
[INFO] [stderr]     Checking pin-project-lite v0.2.7
[INFO] [stderr]    Compiling tokio v1.7.1
[INFO] [stderr]     Checking simple-async-cache-rs v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: could not find `main` in `tokio`
[INFO] [stdout]  --> examples/string_cache.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[tokio::main]
[INFO] [stdout]   |          ^^^^ could not find `main` in `tokio`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> examples/string_cache.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let mut store = AsyncCacheStore::new(10);
[INFO] [stdout]   |         ----^^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0752]: `main` function is not allowed to be `async`
[INFO] [stdout]  --> examples/string_cache.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | async fn main() {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0752.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `simple-async-cache-rs`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e446f899517e18ec8ffef730a3e7ef2fbfb4ae245b2400c8c54f0a9760b93d88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e446f899517e18ec8ffef730a3e7ef2fbfb4ae245b2400c8c54f0a9760b93d88", kill_on_drop: false }`
[INFO] [stdout] e446f899517e18ec8ffef730a3e7ef2fbfb4ae245b2400c8c54f0a9760b93d88