[INFO] fetching crate genawaiter 0.99.1...
[INFO] checking genawaiter-0.99.1 against master#eb10639928a2781cf0a12440007fbcc1e3a6888f for pr-127827-1
[INFO] extracting crate genawaiter 0.99.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate genawaiter 0.99.1 on toolchain eb10639928a2781cf0a12440007fbcc1e3a6888f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate genawaiter 0.99.1
[INFO] finished tweaking crates.io crate genawaiter 0.99.1
[INFO] tweaked toml for crates.io crate genawaiter 0.99.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 28 packages to latest compatible versions
[INFO] [stderr]       Adding proc-macro-error v0.4.12 (latest: v1.0.4)
[INFO] [stderr]       Adding proc-macro-error-attr v0.4.12 (latest: v1.0.4)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.72)
[INFO] [stderr]       Adding syn-mid v0.5.4 (latest: v0.6.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded genawaiter-proc-macro v0.99.1
[INFO] [stderr]   Downloaded proc-macro-error-attr v0.4.12
[INFO] [stderr]   Downloaded proc-macro-error v0.4.12
[INFO] [stderr]   Downloaded genawaiter-macro v0.99.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ddc10efe50fde41539fe963e51f90787ec1480c08a0ab7db18b41f70e80605c8
[INFO] running `Command { std: "docker" "start" "-a" "ddc10efe50fde41539fe963e51f90787ec1480c08a0ab7db18b41f70e80605c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ddc10efe50fde41539fe963e51f90787ec1480c08a0ab7db18b41f70e80605c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ddc10efe50fde41539fe963e51f90787ec1480c08a0ab7db18b41f70e80605c8", kill_on_drop: false }`
[INFO] [stdout] ddc10efe50fde41539fe963e51f90787ec1480c08a0ab7db18b41f70e80605c8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+eb10639928a2781cf0a12440007fbcc1e3a6888f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92d33358b776d99e267c63ff824458faab91b97e111f5b186abd4d730b5114f3
[INFO] running `Command { std: "docker" "start" "-a" "92d33358b776d99e267c63ff824458faab91b97e111f5b186abd4d730b5114f3", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking futures-core v0.3.30
[INFO] [stderr]     Checking futures-sink v0.3.30
[INFO] [stderr]    Compiling proc-macro-hack v0.5.20+deprecated
[INFO] [stderr]     Checking genawaiter-macro v0.99.1
[INFO] [stderr]    Compiling proc-macro-error-attr v0.4.12
[INFO] [stderr]    Compiling proc-macro-error v0.4.12
[INFO] [stderr]    Compiling syn v2.0.72
[INFO] [stderr]     Checking futures-channel v0.3.30
[INFO] [stderr]    Compiling futures-macro v0.3.30
[INFO] [stderr]    Compiling syn-mid v0.5.4
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]    Compiling genawaiter-proc-macro v0.99.1
[INFO] [stderr]     Checking genawaiter v0.99.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking futures-executor v0.3.30
[INFO] [stderr]     Checking futures v0.3.30
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/stack/mod.rs:468:13
[INFO] [stdout]     |
[INFO] [stdout] 468 |             drop(gen);
[INFO] [stdout]     |             ^^^^^---^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut stack::generator::Gen<'_, i32, (), {async block@src/stack/mod.rs:456:17: 456:27}>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 468 -             drop(gen);
[INFO] [stdout] 468 +             let _ = gen;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.97s
[INFO] running `Command { std: "docker" "inspect" "92d33358b776d99e267c63ff824458faab91b97e111f5b186abd4d730b5114f3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92d33358b776d99e267c63ff824458faab91b97e111f5b186abd4d730b5114f3", kill_on_drop: false }`
[INFO] [stdout] 92d33358b776d99e267c63ff824458faab91b97e111f5b186abd4d730b5114f3