[INFO] fetching crate async-once-cell 0.5.4...
[INFO] checking async-once-cell-0.5.4 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate async-once-cell 0.5.4 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate async-once-cell 0.5.4
[INFO] finished tweaking crates.io crate async-once-cell 0.5.4
[INFO] tweaked toml for crates.io crate async-once-cell 0.5.4 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate async-once-cell 0.5.4 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]     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 1 package to latest compatible version
[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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 9e7cc8849a81ae9ca359ac1732a38d767499477451f8344e65ec60be6e57fd69
[INFO] running `Command { std: "docker" "start" "-a" "9e7cc8849a81ae9ca359ac1732a38d767499477451f8344e65ec60be6e57fd69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e7cc8849a81ae9ca359ac1732a38d767499477451f8344e65ec60be6e57fd69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e7cc8849a81ae9ca359ac1732a38d767499477451f8344e65ec60be6e57fd69", kill_on_drop: false }`
[INFO] [stdout] 9e7cc8849a81ae9ca359ac1732a38d767499477451f8344e65ec60be6e57fd69
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 910ef1e614ec0bab09a64d3f56ac31174ee96473d3cc6afa16cd3e87bcf10d31
[INFO] running `Command { std: "docker" "start" "-a" "910ef1e614ec0bab09a64d3f56ac31174ee96473d3cc6afa16cd3e87bcf10d31", kill_on_drop: false }`
[INFO] [stderr]     Checking async-once-cell v0.5.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:319:19
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn initialize(&self, try_quick: bool) -> Result<QueueWaiter, QuickInitGuard> {
[INFO] [stdout]     |                   ^^^^^                             ^^^^^^^^^^^  ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |                                 |
[INFO] [stdout]     |                   the lifetime is elided here       the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn initialize(&self, try_quick: bool) -> Result<QueueWaiter<'_>, QuickInitGuard<'_>> {
[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:762:15
[INFO] [stdout]     |
[INFO] [stdout] 762 |         match InitFuture::new(self, |cx| init.as_mut().poll(cx).map(Ok::<T, Infallible>)).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:762:91
[INFO] [stdout]     |
[INFO] [stdout] 762 |         match InitFuture::new(self, |cx| init.as_mut().poll(cx).map(Ok::<T, Infallible>)).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:762:15
[INFO] [stdout]     |
[INFO] [stdout] 762 |         match InitFuture::new(self, |cx| init.as_mut().poll(cx).map(Ok::<T, Infallible>)).await {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-once-cell` (lib) due to 3 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:319:19
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn initialize(&self, try_quick: bool) -> Result<QueueWaiter, QuickInitGuard> {
[INFO] [stdout]     |                   ^^^^^                             ^^^^^^^^^^^  ^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                   |                                 |
[INFO] [stdout]     |                   the lifetime is elided here       the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn initialize(&self, try_quick: bool) -> Result<QueueWaiter<'_>, QuickInitGuard<'_>> {
[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:762:15
[INFO] [stdout]     |
[INFO] [stdout] 762 |         match InitFuture::new(self, |cx| init.as_mut().poll(cx).map(Ok::<T, Infallible>)).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:762:91
[INFO] [stdout]     |
[INFO] [stdout] 762 |         match InitFuture::new(self, |cx| init.as_mut().poll(cx).map(Ok::<T, Infallible>)).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:762:15
[INFO] [stdout]     |
[INFO] [stdout] 762 |         match InitFuture::new(self, |cx| init.as_mut().poll(cx).map(Ok::<T, Infallible>)).await {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `async-once-cell` (lib test) due to 3 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "910ef1e614ec0bab09a64d3f56ac31174ee96473d3cc6afa16cd3e87bcf10d31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "910ef1e614ec0bab09a64d3f56ac31174ee96473d3cc6afa16cd3e87bcf10d31", kill_on_drop: false }`
[INFO] [stdout] 910ef1e614ec0bab09a64d3f56ac31174ee96473d3cc6afa16cd3e87bcf10d31