[INFO] fetching crate simple-async-cache-rs 0.2.0...
[INFO] testing simple-async-cache-rs-0.2.0 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate simple-async-cache-rs 0.2.0 into /workspace/builds/worker-15/source
[INFO] validating manifest of crates.io crate simple-async-cache-rs 0.2.0 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate simple-async-cache-rs 0.2.0
[INFO] finished tweaking crates.io crate simple-async-cache-rs 0.2.0
[INFO] tweaked toml for crates.io crate simple-async-cache-rs 0.2.0 written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate crates.io crate simple-async-cache-rs 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b1432bcd24e62b5fcf10846489eda7506121530845438982b2d656ca12fb2819
[INFO] running `Command { std: "docker" "start" "-a" "b1432bcd24e62b5fcf10846489eda7506121530845438982b2d656ca12fb2819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1432bcd24e62b5fcf10846489eda7506121530845438982b2d656ca12fb2819", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1432bcd24e62b5fcf10846489eda7506121530845438982b2d656ca12fb2819", kill_on_drop: false }`
[INFO] [stdout] b1432bcd24e62b5fcf10846489eda7506121530845438982b2d656ca12fb2819
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e517fe42729343837001e409f90fcab4cfa32bdeb4fdce7bf48a545f2d44473a
[INFO] running `Command { std: "docker" "start" "-a" "e517fe42729343837001e409f90fcab4cfa32bdeb4fdce7bf48a545f2d44473a", kill_on_drop: false }`
[INFO] [stderr]    Compiling tokio v1.7.1
[INFO] [stderr]    Compiling simple-async-cache-rs v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.01s
[INFO] running `Command { std: "docker" "inspect" "e517fe42729343837001e409f90fcab4cfa32bdeb4fdce7bf48a545f2d44473a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e517fe42729343837001e409f90fcab4cfa32bdeb4fdce7bf48a545f2d44473a", kill_on_drop: false }`
[INFO] [stdout] e517fe42729343837001e409f90fcab4cfa32bdeb4fdce7bf48a545f2d44473a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 74e428f99303dbfa92cc38175f90d58e602b4703607e1d094ff7e42d5fb6b8b9
[INFO] running `Command { std: "docker" "start" "-a" "74e428f99303dbfa92cc38175f90d58e602b4703607e1d094ff7e42d5fb6b8b9", kill_on_drop: false }`
[INFO] [stderr]    Compiling simple-async-cache-rs v0.2.0 (/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` due to 3 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "74e428f99303dbfa92cc38175f90d58e602b4703607e1d094ff7e42d5fb6b8b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "74e428f99303dbfa92cc38175f90d58e602b4703607e1d094ff7e42d5fb6b8b9", kill_on_drop: false }`
[INFO] [stdout] 74e428f99303dbfa92cc38175f90d58e602b4703607e1d094ff7e42d5fb6b8b9