[INFO] cloning repository https://github.com/RustyYato/double-buffer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/RustyYato/double-buffer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRustyYato%2Fdouble-buffer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRustyYato%2Fdouble-buffer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b3ee50e221e71aec30924adbbb57c0cf3f4472a4
[INFO] checking RustyYato/double-buffer against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FRustyYato%2Fdouble-buffer" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/RustyYato/double-buffer
[INFO] finished tweaking git repo https://github.com/RustyYato/double-buffer
[INFO] tweaked toml for git repo https://github.com/RustyYato/double-buffer written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/RustyYato/double-buffer 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 git repo https://github.com/RustyYato/double-buffer 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 48bb8cc02c3d4e9e68d19d2273d5e1be828df985c1bba284f34365da97cb7b37
[INFO] running `Command { std: "docker" "start" "-a" "48bb8cc02c3d4e9e68d19d2273d5e1be828df985c1bba284f34365da97cb7b37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "48bb8cc02c3d4e9e68d19d2273d5e1be828df985c1bba284f34365da97cb7b37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48bb8cc02c3d4e9e68d19d2273d5e1be828df985c1bba284f34365da97cb7b37", kill_on_drop: false }`
[INFO] [stdout] 48bb8cc02c3d4e9e68d19d2273d5e1be828df985c1bba284f34365da97cb7b37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] b75f435db31352ac974adb8645d4ec46d950633972c27f82f69ebf4e78b85c7f
[INFO] running `Command { std: "docker" "start" "-a" "b75f435db31352ac974adb8645d4ec46d950633972c27f82f69ebf4e78b85c7f", kill_on_drop: false }`
[INFO] [stderr]    Compiling const_fn v0.4.10
[INFO] [stderr]     Checking rc-box v1.2.0
[INFO] [stderr]     Checking triomphe v0.1.11
[INFO] [stderr]     Checking split-arc v0.1.0 (/opt/rustwide/workdir/split-arc)
[INFO] [stderr]     Checking hashbrown v0.15.2
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.63
[INFO] [stderr]     Checking dbuf v0.1.0 (/opt/rustwide/workdir/dbuf)
[INFO] [stdout] warning: function `test_send_sync` is never used
[INFO] [stdout]   --> dbuf/src/raw.rs:49:14
[INFO] [stdout]    |
[INFO] [stdout] 49 |     const fn test_send_sync<T: Send, U: Sync>() {
[INFO] [stdout]    |              ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&DoubleBufferData<T, S, Extras>, Infallible>
[INFO] [stdout]   --> dbuf/src/ext.rs:72:81
[INFO] [stdout]    |
[INFO] [stdout] 72 |       fn try_writer(&self) -> Result<Self::MaybeBorrowed<'_>, Self::UpgradeError> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 73 | |         Ok(self)
[INFO] [stdout] 74 | |     }
[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<&DoubleBufferData<T, S, Extras>, Infallible>
[INFO] [stdout]   --> dbuf/src/ext.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |         Ok(self)
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&OffsetArc<DoubleBufferData<T, S, Extras>>, Infallible>
[INFO] [stdout]   --> dbuf/src/ext/triomphe.rs:67:81
[INFO] [stdout]    |
[INFO] [stdout] 67 |       fn try_writer(&self) -> Result<Self::MaybeBorrowed<'_>, Self::UpgradeError> {
[INFO] [stdout]    |  _________________________________________________________________________________^
[INFO] [stdout] 68 | |         Ok(self)
[INFO] [stdout] 69 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&OffsetArc<DoubleBufferData<T, S, Extras>>, Infallible>
[INFO] [stdout]   --> dbuf/src/ext/triomphe.rs:68:9
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Ok(self)
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<flashmap::Swap, Infallible>
[INFO] [stdout]    --> dbuf/src/strategy/flashmap.rs:209:46
[INFO] [stdout]     |
[INFO] [stdout] 209 |       ) -> Result<Self::Swap, Self::SwapError> {
[INFO] [stdout]     |  ______________________________________________^
[INFO] [stdout] 210 | |         let mut readers = self.readers.lock().unwrap_or_else(PoisonError::into_inner);
[INFO] [stdout] ...   |
[INFO] [stdout] 240 | |         Ok(Swap)
[INFO] [stdout] 241 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<flashmap::Swap, Infallible>
[INFO] [stdout]    --> dbuf/src/strategy/flashmap.rs:240:9
[INFO] [stdout]     |
[INFO] [stdout] 240 |         Ok(Swap)
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<evmap::Swap, Infallible>
[INFO] [stdout]    --> dbuf/src/strategy/evmap.rs:126:46
[INFO] [stdout]     |
[INFO] [stdout] 126 |       ) -> Result<Self::Swap, Self::SwapError> {
[INFO] [stdout]     |  ______________________________________________^
[INFO] [stdout] 127 | |         self.is_swapped.fetch_xor(true, Ordering::AcqRel);
[INFO] [stdout] 128 | |
[INFO] [stdout] 129 | |         let mut epochs = self.epochs.lock().unwrap_or_else(PoisonError::into_inner);
[INFO] [stdout] ...   |
[INFO] [stdout] 140 | |         Ok(Swap { start: 0 })
[INFO] [stdout] 141 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<evmap::Swap, Infallible>
[INFO] [stdout]    --> dbuf/src/strategy/evmap.rs:140:9
[INFO] [stdout]     |
[INFO] [stdout] 140 |         Ok(Swap { start: 0 })
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<reader::ReaderGuard<'_, U, P>, (reader::ReaderGuard<'_, T, P>, Infallible)>
[INFO] [stdout]    --> dbuf/src/raw/reader.rs:156:15
[INFO] [stdout]     |
[INFO] [stdout] 156 |         match self.try_map::<_, core::convert::Infallible>(move |t| Ok(f(t))) {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&U, Infallible>
[INFO] [stdout]    --> dbuf/src/raw/reader.rs:156:69
[INFO] [stdout]     |
[INFO] [stdout] 156 |         match self.try_map::<_, core::convert::Infallible>(move |t| Ok(f(t))) {
[INFO] [stdout]     |                                                                     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<reader::ReaderGuard<'_, U, P>, (reader::ReaderGuard<'_, T, P>, Infallible)>
[INFO] [stdout]    --> dbuf/src/raw/reader.rs:183:15
[INFO] [stdout]     |
[INFO] [stdout] 183 |         match self.try_map_with_extras::<_, core::convert::Infallible>(move |t, e| Ok(f(t, e))) {
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&U, Infallible>
[INFO] [stdout]    --> dbuf/src/raw/reader.rs:183:84
[INFO] [stdout]     |
[INFO] [stdout] 183 |         match self.try_map_with_extras::<_, core::convert::Infallible>(move |t, e| Ok(f(t, e))) {
[INFO] [stdout]     |                                                                                    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> dbuf/src/raw/writer.rs:64:18
[INFO] [stdout]    |
[INFO] [stdout] 64 |     pub fn split(&self) -> Split<P::Buffer, P::Extras> {
[INFO] [stdout]    |                  ^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                  |
[INFO] [stdout]    |                  the lifetime is elided 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] 64 |     pub fn split(&self) -> Split<'_, P::Buffer, P::Extras> {
[INFO] [stdout]    |                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> dbuf/src/raw/writer.rs:86:22
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn split_mut(&mut self) -> SplitMut<P::Buffer, P::Extras> {
[INFO] [stdout]    |                      ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 86 |     pub fn split_mut(&mut self) -> SplitMut<'_, P::Buffer, P::Extras> {
[INFO] [stdout]    |                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dbuf` (lib) due to 12 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "b75f435db31352ac974adb8645d4ec46d950633972c27f82f69ebf4e78b85c7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b75f435db31352ac974adb8645d4ec46d950633972c27f82f69ebf4e78b85c7f", kill_on_drop: false }`
[INFO] [stdout] b75f435db31352ac974adb8645d4ec46d950633972c27f82f69ebf4e78b85c7f
