[INFO] fetching crate async-oncecell 0.2.0...
[INFO] checking async-oncecell-0.2.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate async-oncecell 0.2.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate async-oncecell 0.2.0
[INFO] finished tweaking crates.io crate async-oncecell 0.2.0
[INFO] tweaked toml for crates.io crate async-oncecell 0.2.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate async-oncecell 0.2.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 24 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b24cf5b7dda54a38a40b0836159dc3fe5702b241f8426f694d1a6431aabab65f
[INFO] running `Command { std: "docker" "start" "-a" "b24cf5b7dda54a38a40b0836159dc3fe5702b241f8426f694d1a6431aabab65f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b24cf5b7dda54a38a40b0836159dc3fe5702b241f8426f694d1a6431aabab65f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b24cf5b7dda54a38a40b0836159dc3fe5702b241f8426f694d1a6431aabab65f", kill_on_drop: false }`
[INFO] [stdout] b24cf5b7dda54a38a40b0836159dc3fe5702b241f8426f694d1a6431aabab65f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a5b5f6d18b6586c1662efaacd2d4d3bfd3b33aa3575bdea65cc9b17fb0ea340f
[INFO] running `Command { std: "docker" "start" "-a" "a5b5f6d18b6586c1662efaacd2d4d3bfd3b33aa3575bdea65cc9b17fb0ea340f", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-channel v0.3.31
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling async-stream-impl v0.3.6
[INFO] [stderr]     Checking tokio v1.48.0
[INFO] [stderr]     Checking async-stream v0.3.6
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking tokio-stream v0.1.17
[INFO] [stderr]     Checking tokio-test v0.4.4
[INFO] [stderr]     Checking futures-executor v0.3.31
[INFO] [stderr]     Checking futures v0.3.31
[INFO] [stderr]     Checking async-oncecell v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]   --> src/lib.rs:65:15
[INFO] [stdout]    |
[INFO] [stdout] 65 |           match self
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 66 | |             .get_or_try_init(async { Ok::<_, Infallible>(f.await) })
[INFO] [stdout] 67 | |             .await
[INFO] [stdout]    | |__________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]   --> src/lib.rs:67:14
[INFO] [stdout]    |
[INFO] [stdout] 67 |             .await
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]   --> src/lib.rs:65:15
[INFO] [stdout]    |
[INFO] [stdout] 65 |           match self
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 66 | |             .get_or_try_init(async { Ok::<_, Infallible>(f.await) })
[INFO] [stdout] 67 | |             .await
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]   --> src/lib.rs:65:15
[INFO] [stdout]    |
[INFO] [stdout] 65 |           match self
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 66 | |             .get_or_try_init(async { Ok::<_, Infallible>(f.await) })
[INFO] [stdout] 67 | |             .await
[INFO] [stdout]    | |__________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]   --> src/lib.rs:67:14
[INFO] [stdout]    |
[INFO] [stdout] 67 |             .await
[INFO] [stdout]    |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]   --> src/lib.rs:65:15
[INFO] [stdout]    |
[INFO] [stdout] 65 |           match self
[INFO] [stdout]    |  _______________^
[INFO] [stdout] 66 | |             .get_or_try_init(async { Ok::<_, Infallible>(f.await) })
[INFO] [stdout] 67 | |             .await
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-oncecell` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `async-oncecell` (lib test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "a5b5f6d18b6586c1662efaacd2d4d3bfd3b33aa3575bdea65cc9b17fb0ea340f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a5b5f6d18b6586c1662efaacd2d4d3bfd3b33aa3575bdea65cc9b17fb0ea340f", kill_on_drop: false }`
[INFO] [stdout] a5b5f6d18b6586c1662efaacd2d4d3bfd3b33aa3575bdea65cc9b17fb0ea340f