[INFO] fetching crate async-lock 3.4.1...
[INFO] checking async-lock-3.4.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate async-lock 3.4.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate async-lock 3.4.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate async-lock 3.4.1
[INFO] tweaked toml for crates.io crate async-lock 3.4.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate async-lock 3.4.1 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] crate crates.io crate async-lock 3.4.1 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 691ee69de279ea8a10ea3d6a318ebc040e5f42b8226902a7ead28a6828e16c99
[INFO] running `Command { std: "docker" "start" "-a" "691ee69de279ea8a10ea3d6a318ebc040e5f42b8226902a7ead28a6828e16c99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "691ee69de279ea8a10ea3d6a318ebc040e5f42b8226902a7ead28a6828e16c99", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "691ee69de279ea8a10ea3d6a318ebc040e5f42b8226902a7ead28a6828e16c99", kill_on_drop: false }`
[INFO] [stdout] 691ee69de279ea8a10ea3d6a318ebc040e5f42b8226902a7ead28a6828e16c99
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] d9b80818b5b0d50d02983d5e891387ae3f1dddd9c3586048ebb3b81456875da4
[INFO] running `Command { std: "docker" "start" "-a" "d9b80818b5b0d50d02983d5e891387ae3f1dddd9c3586048ebb3b81456875da4", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]     Checking futures-lite v2.6.0
[INFO] [stderr]     Checking getrandom v0.2.16
[INFO] [stderr]     Checking spin v0.9.8
[INFO] [stderr]     Checking nanorand v0.7.0
[INFO] [stderr]     Checking flume v0.11.1
[INFO] [stderr]     Checking concurrent-queue v2.5.0
[INFO] [stderr]     Checking event-listener v5.4.0
[INFO] [stderr]     Checking event-listener-strategy v0.5.4
[INFO] [stderr]     Checking async-lock v3.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:481:15
[INFO] [stdout]     |
[INFO] [stdout] 481 |           match self
[INFO] [stdout]     |  _______________^
[INFO] [stdout] 482 | |             .get_or_try_init(move || async move {
[INFO] [stdout] 483 | |                 let result: Result<T, Infallible> = Ok(closure().await);
[INFO] [stdout] 484 | |                 result
[INFO] [stdout] 485 | |             })
[INFO] [stdout] 486 | |             .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/once_cell.rs:486:14
[INFO] [stdout]     |
[INFO] [stdout] 486 |             .await
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:481:15
[INFO] [stdout]     |
[INFO] [stdout] 481 |           match self
[INFO] [stdout]     |  _______________^
[INFO] [stdout] 482 | |             .get_or_try_init(move || async move {
[INFO] [stdout] 483 | |                 let result: Result<T, Infallible> = Ok(closure().await);
[INFO] [stdout] 484 | |                 result
[INFO] [stdout] 485 | |             })
[INFO] [stdout] 486 | |             .await
[INFO] [stdout]     | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:518:22
[INFO] [stdout]     |
[INFO] [stdout] 518 |           let result = self.get_or_try_init_blocking(move || {
[INFO] [stdout]     |  ______________________^
[INFO] [stdout] 519 | |             let result: Result<T, Infallible> = Ok(closure());
[INFO] [stdout] 520 | |             result
[INFO] [stdout] 521 | |         });
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:525:15
[INFO] [stdout]     |
[INFO] [stdout] 525 |         match result {
[INFO] [stdout]     |               ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-lock` (lib) due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:481:15
[INFO] [stdout]     |
[INFO] [stdout] 481 |           match self
[INFO] [stdout]     |  _______________^
[INFO] [stdout] 482 | |             .get_or_try_init(move || async move {
[INFO] [stdout] 483 | |                 let result: Result<T, Infallible> = Ok(closure().await);
[INFO] [stdout] 484 | |                 result
[INFO] [stdout] 485 | |             })
[INFO] [stdout] 486 | |             .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/once_cell.rs:486:14
[INFO] [stdout]     |
[INFO] [stdout] 486 |             .await
[INFO] [stdout]     |              ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:481:15
[INFO] [stdout]     |
[INFO] [stdout] 481 |           match self
[INFO] [stdout]     |  _______________^
[INFO] [stdout] 482 | |             .get_or_try_init(move || async move {
[INFO] [stdout] 483 | |                 let result: Result<T, Infallible> = Ok(closure().await);
[INFO] [stdout] 484 | |                 result
[INFO] [stdout] 485 | |             })
[INFO] [stdout] 486 | |             .await
[INFO] [stdout]     | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:518:22
[INFO] [stdout]     |
[INFO] [stdout] 518 |           let result = self.get_or_try_init_blocking(move || {
[INFO] [stdout]     |  ______________________^
[INFO] [stdout] 519 | |             let result: Result<T, Infallible> = Ok(closure());
[INFO] [stdout] 520 | |             result
[INFO] [stdout] 521 | |         });
[INFO] [stdout]     | |__________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&T, Infallible>
[INFO] [stdout]    --> src/once_cell.rs:525:15
[INFO] [stdout]     |
[INFO] [stdout] 525 |         match result {
[INFO] [stdout]     |               ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-lock` (lib test) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "d9b80818b5b0d50d02983d5e891387ae3f1dddd9c3586048ebb3b81456875da4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9b80818b5b0d50d02983d5e891387ae3f1dddd9c3586048ebb3b81456875da4", kill_on_drop: false }`
[INFO] [stdout] d9b80818b5b0d50d02983d5e891387ae3f1dddd9c3586048ebb3b81456875da4