[INFO] fetching crate async_fn 0.1.0...
[INFO] checking async_fn-0.1.0 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] extracting crate async_fn 0.1.0 into /workspace/builds/worker-5-tc2/source
[INFO] removed /workspace/builds/worker-5-tc2/source/.cargo/config
[INFO] removed /workspace/builds/worker-5-tc2/source/rust-toolchain
[INFO] started tweaking crates.io crate async_fn 0.1.0
[INFO] finished tweaking crates.io crate async_fn 0.1.0
[INFO] tweaked toml for crates.io crate async_fn 0.1.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate async_fn 0.1.0 on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 6 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9361b4373459a2337b4a537643e46b5f426c8e1d6f2d2a72dc0802c1b262058d
[INFO] running `Command { std: "docker" "start" "-a" "9361b4373459a2337b4a537643e46b5f426c8e1d6f2d2a72dc0802c1b262058d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9361b4373459a2337b4a537643e46b5f426c8e1d6f2d2a72dc0802c1b262058d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9361b4373459a2337b4a537643e46b5f426c8e1d6f2d2a72dc0802c1b262058d", kill_on_drop: false }`
[INFO] [stdout] 9361b4373459a2337b4a537643e46b5f426c8e1d6f2d2a72dc0802c1b262058d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 40823627a1bb95ae2358c6455faea7dd14d03c5bbf588afe445cc34cb755bc33
[INFO] running `Command { std: "docker" "start" "-a" "40823627a1bb95ae2358c6455faea7dd14d03c5bbf588afe445cc34cb755bc33", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling unicode-ident v1.0.18
[INFO] [stderr]     Checking extreme v666.666.666666
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling async_fn-proc_macros v0.1.0
[INFO] [stderr]     Checking async_fn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `fun` is never used
[INFO] [stdout]  --> tests/main.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     fn fun ()
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fun` is never used
[INFO] [stdout]   --> tests/main.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn fun (it: &'_ ())
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `fun` is never used
[INFO] [stdout]   --> tests/main.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 |     fn fun (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: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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.53s
[INFO] running `Command { std: "docker" "inspect" "40823627a1bb95ae2358c6455faea7dd14d03c5bbf588afe445cc34cb755bc33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40823627a1bb95ae2358c6455faea7dd14d03c5bbf588afe445cc34cb755bc33", kill_on_drop: false }`
[INFO] [stdout] 40823627a1bb95ae2358c6455faea7dd14d03c5bbf588afe445cc34cb755bc33