[INFO] cloning repository https://github.com/danielhenrymantilla/async_fn.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danielhenrymantilla/async_fn.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielhenrymantilla%2Fasync_fn.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielhenrymantilla%2Fasync_fn.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a366aa016117912712621eac9ef2d7f52d2c9707
[INFO] checking danielhenrymantilla/async_fn.rs/a366aa016117912712621eac9ef2d7f52d2c9707 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielhenrymantilla%2Fasync_fn.rs" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danielhenrymantilla/async_fn.rs on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-2-tc1/source/.cargo/config
[INFO] removed /workspace/builds/worker-2-tc1/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/danielhenrymantilla/async_fn.rs
[INFO] finished tweaking git repo https://github.com/danielhenrymantilla/async_fn.rs
[INFO] tweaked toml for git repo https://github.com/danielhenrymantilla/async_fn.rs written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/danielhenrymantilla/async_fn.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--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]  Downloading crates ...
[INFO] [stderr]   Downloaded extreme v666.666.666666
[INFO] [stderr]   Downloaded proc-macro2 v1.0.0
[INFO] [stderr]   Downloaded quote v1.0.0
[INFO] [stderr]   Downloaded syn v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ceefa3a2d93ded8abd9ba1140d9a90cd0f2b8f92dce892aa79c07b8334e08d57
[INFO] running `Command { std: "docker" "start" "-a" "ceefa3a2d93ded8abd9ba1140d9a90cd0f2b8f92dce892aa79c07b8334e08d57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ceefa3a2d93ded8abd9ba1140d9a90cd0f2b8f92dce892aa79c07b8334e08d57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ceefa3a2d93ded8abd9ba1140d9a90cd0f2b8f92dce892aa79c07b8334e08d57", kill_on_drop: false }`
[INFO] [stdout] ceefa3a2d93ded8abd9ba1140d9a90cd0f2b8f92dce892aa79c07b8334e08d57
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dfe749b2236d4aebe3691ec454be7fc0827a1e8f0956f30325d1c53e03c3aed4
[INFO] running `Command { std: "docker" "start" "-a" "dfe749b2236d4aebe3691ec454be7fc0827a1e8f0956f30325d1c53e03c3aed4", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.0
[INFO] [stderr]    Compiling syn v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]     Checking extreme v666.666.666666
[INFO] [stderr]     Checking quote v1.0.0
[INFO] [stderr]     Checking async_fn-proc_macros v0.0.2 (/opt/rustwide/workdir/src/proc_macros)
[INFO] [stderr]     Checking async_fn v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> tests/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         drop(it);
[INFO] [stdout]    |         ^^^^^--^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              argument has type `&()`
[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] 17 -         drop(it);
[INFO] [stdout] 17 +         let _ = it;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]   --> tests/main.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |         drop(it);
[INFO] [stdout]    |         ^^^^^--^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              argument has type `&()`
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]    |
[INFO] [stdout] 26 -         drop(it);
[INFO] [stdout] 26 +         let _ = it;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.56s
[INFO] running `Command { std: "docker" "inspect" "dfe749b2236d4aebe3691ec454be7fc0827a1e8f0956f30325d1c53e03c3aed4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfe749b2236d4aebe3691ec454be7fc0827a1e8f0956f30325d1c53e03c3aed4", kill_on_drop: false }`
[INFO] [stdout] dfe749b2236d4aebe3691ec454be7fc0827a1e8f0956f30325d1c53e03c3aed4