[INFO] fetching crate shuttle 0.0.7...
[INFO] checking shuttle-0.0.7 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate shuttle 0.0.7 into /workspace/builds/worker-93/source
[INFO] validating manifest of crates.io crate shuttle 0.0.7 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate shuttle 0.0.7
[INFO] finished tweaking crates.io crate shuttle 0.0.7
[INFO] tweaked toml for crates.io crate shuttle 0.0.7 written to /workspace/builds/worker-93/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a70f45a2512a418f2fe79cf19c569b38528607490f1d1f082c24f9ac379dee2b
[INFO] running `Command { std: "docker" "start" "-a" "a70f45a2512a418f2fe79cf19c569b38528607490f1d1f082c24f9ac379dee2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a70f45a2512a418f2fe79cf19c569b38528607490f1d1f082c24f9ac379dee2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a70f45a2512a418f2fe79cf19c569b38528607490f1d1f082c24f9ac379dee2b", kill_on_drop: false }`
[INFO] [stdout] a70f45a2512a418f2fe79cf19c569b38528607490f1d1f082c24f9ac379dee2b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-93/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c77efd7915c98b704e7932a34119ad7786c74ecb26ce4a2537b4453f11f241cf
[INFO] running `Command { std: "docker" "start" "-a" "c77efd7915c98b704e7932a34119ad7786c74ecb26ce4a2537b4453f11f241cf", 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]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.108
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling ryu v1.0.6
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling futures-core v0.3.18
[INFO] [stderr]    Compiling rustversion v1.0.5
[INFO] [stderr]    Compiling futures-channel v0.3.18
[INFO] [stderr]    Compiling serde_json v1.0.72
[INFO] [stderr]    Compiling cc v1.0.72
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking futures-sink v0.3.18
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking wyz v0.2.0
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]     Checking funty v1.2.0
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking varmint v0.1.3
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking tracing-core v0.1.21
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking crossbeam-utils v0.8.5
[INFO] [stderr]     Checking thread_local v1.1.3
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking bit-set v0.5.2
[INFO] [stderr]     Checking tracing v0.1.29
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking tracing-log v0.1.2
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking bitvec v0.21.2
[INFO] [stderr]     Checking crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling generator v0.7.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rayon-core v1.9.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand_xorshift v0.2.0
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking plotters v0.3.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking tempfile v3.2.0
[INFO] [stderr]     Checking rusty-fork v0.3.0
[INFO] [stderr]     Checking proptest v0.10.1
[INFO] [stderr]     Checking shuttle v0.0.7 (/opt/rustwide/workdir)
[INFO] [stdout] error: `must_use` attribute on `async` functions applies to the anonymous `Future` returned by the function, not the value within
[INFO] [stdout]    --> src/asynch.rs:162:1
[INFO] [stdout]     |
[INFO] [stdout] 162 |   #[must_use = "yield_now does nothing unless polled/`await`-ed"]
[INFO] [stdout]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 163 | / pub async fn yield_now() {
[INFO] [stdout] 164 | |     /// Yield implementation
[INFO] [stdout] 165 | |     struct YieldNow {
[INFO] [stdout] 166 | |         yielded: bool,
[INFO] [stdout] ...   |
[INFO] [stdout] 184 | |     YieldNow { yielded: false }.await
[INFO] [stdout] 185 | | }
[INFO] [stdout]     | |_- this attribute does nothing, the `Future`s returned by async functions are already `must_use`
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:1:9
[INFO] [stdout]     |
[INFO] [stdout] 1   | #![deny(warnings, missing_debug_implementations, missing_docs)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_attributes)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking tracing-serde v0.1.2
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `shuttle` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "c77efd7915c98b704e7932a34119ad7786c74ecb26ce4a2537b4453f11f241cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c77efd7915c98b704e7932a34119ad7786c74ecb26ce4a2537b4453f11f241cf", kill_on_drop: false }`
[INFO] [stdout] c77efd7915c98b704e7932a34119ad7786c74ecb26ce4a2537b4453f11f241cf