[INFO] fetching crate futures-promises 0.1.11...
[INFO] checking futures-promises-0.1.11 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate futures-promises 0.1.11 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate futures-promises 0.1.11
[INFO] finished tweaking crates.io crate futures-promises 0.1.11
[INFO] tweaked toml for crates.io crate futures-promises 0.1.11 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate futures-promises 0.1.11 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 1 package to latest compatible version
[INFO] [stderr]       Adding futures v0.1.31 (available: v0.3.31)
[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-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] c568c89909adcb99b32f106293dc102ca6ffc5a81b4a5d18716f1c458e724aaf
[INFO] running `Command { std: "docker" "start" "-a" "c568c89909adcb99b32f106293dc102ca6ffc5a81b4a5d18716f1c458e724aaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c568c89909adcb99b32f106293dc102ca6ffc5a81b4a5d18716f1c458e724aaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c568c89909adcb99b32f106293dc102ca6ffc5a81b4a5d18716f1c458e724aaf", kill_on_drop: false }`
[INFO] [stdout] c568c89909adcb99b32f106293dc102ca6ffc5a81b4a5d18716f1c458e724aaf
[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] 98751dd8fde6190eae93f1badf82cbc78b88ceef72866262115eba961415b129
[INFO] running `Command { std: "docker" "start" "-a" "98751dd8fde6190eae93f1badf82cbc78b88ceef72866262115eba961415b129", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-promises v0.1.11 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> src/lib.rs:55:19
[INFO] [stdout]    |
[INFO] [stdout] 55 |             match (&mut guard.1) {
[INFO] [stdout]    |                   ^            ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 55 -             match (&mut guard.1) {
[INFO] [stdout] 55 +             match &mut guard.1  {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `match` scrutinee expression
[INFO] [stdout]   --> src/lib.rs:55:19
[INFO] [stdout]    |
[INFO] [stdout] 55 |             match (&mut guard.1) {
[INFO] [stdout]    |                   ^            ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 55 -             match (&mut guard.1) {
[INFO] [stdout] 55 +             match &mut guard.1  {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:52:93
[INFO] [stdout]    |
[INFO] [stdout] 52 |           fn poll(&mut self) -> Poll<Option<<Self as Stream>::Item>, <Self as Stream>::Error> {
[INFO] [stdout]    |  _____________________________________________________________________________________________^
[INFO] [stdout] 53 | |             self.task.register();
[INFO] [stdout] 54 | |             let mut guard = self.content.lock().unwrap();
[INFO] [stdout] 55 | |             match (&mut guard.1) {
[INFO] [stdout] ...  |
[INFO] [stdout] 66 | |         }
[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<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:52:93
[INFO] [stdout]    |
[INFO] [stdout] 52 |           fn poll(&mut self) -> Poll<Option<<Self as Stream>::Item>, <Self as Stream>::Error> {
[INFO] [stdout]    |  _____________________________________________________________________________________________^
[INFO] [stdout] 53 | |             self.task.register();
[INFO] [stdout] 54 | |             let mut guard = self.content.lock().unwrap();
[INFO] [stdout] 55 | |             match (&mut guard.1) {
[INFO] [stdout] ...  |
[INFO] [stdout] 66 | |         }
[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<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 | /             match (&mut guard.1) {
[INFO] [stdout] 56 | |                 StreamState::NotReady => Ok(Async::NotReady),
[INFO] [stdout] 57 | |                 StreamState::Closed => Ok(Async::Ready(None)),
[INFO] [stdout] 58 | |                 StreamState::Ready(count) => {
[INFO] [stdout] ...  |
[INFO] [stdout] 65 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:56:42
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 StreamState::NotReady => Ok(Async::NotReady),
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:57:40
[INFO] [stdout]    |
[INFO] [stdout] 57 |                 StreamState::Closed => Ok(Async::Ready(None)),
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:58:46
[INFO] [stdout]    |
[INFO] [stdout] 58 |                   StreamState::Ready(count) => {
[INFO] [stdout]    |  ______________________________________________^
[INFO] [stdout] 59 | |                     *count -= 1;
[INFO] [stdout] 60 | |                     if *count <= 0 {
[INFO] [stdout] 61 | |                         (*guard).1 = StreamState::NotReady;
[INFO] [stdout] 62 | |                     }
[INFO] [stdout] 63 | |                     Ok(Async::Ready(Some(self.content.clone())))
[INFO] [stdout] 64 | |                 }
[INFO] [stdout]    | |_________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:63:21
[INFO] [stdout]    |
[INFO] [stdout] 63 |                     Ok(Async::Ready(Some(self.content.clone())))
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:108:21
[INFO] [stdout]     |
[INFO] [stdout] 108 |         pub fn lock(&self) -> WatchedVariableAccessor<T> {
[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] 108 |         pub fn lock(&self) -> WatchedVariableAccessor<'_, T> {
[INFO] [stdout]     |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:55:13
[INFO] [stdout]    |
[INFO] [stdout] 55 | /             match (&mut guard.1) {
[INFO] [stdout] 56 | |                 StreamState::NotReady => Ok(Async::NotReady),
[INFO] [stdout] 57 | |                 StreamState::Closed => Ok(Async::Ready(None)),
[INFO] [stdout] 58 | |                 StreamState::Ready(count) => {
[INFO] [stdout] ...  |
[INFO] [stdout] 65 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:56:42
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 StreamState::NotReady => Ok(Async::NotReady),
[INFO] [stdout]    |                                          ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:57:40
[INFO] [stdout]    |
[INFO] [stdout] 57 |                 StreamState::Closed => Ok(Async::Ready(None)),
[INFO] [stdout]    |                                        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:58:46
[INFO] [stdout]    |
[INFO] [stdout] 58 |                   StreamState::Ready(count) => {
[INFO] [stdout]    |  ______________________________________________^
[INFO] [stdout] 59 | |                     *count -= 1;
[INFO] [stdout] 60 | |                     if *count <= 0 {
[INFO] [stdout] 61 | |                         (*guard).1 = StreamState::NotReady;
[INFO] [stdout] 62 | |                     }
[INFO] [stdout] 63 | |                     Ok(Async::Ready(Some(self.content.clone())))
[INFO] [stdout] 64 | |                 }
[INFO] [stdout]    | |_________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Async<Option<Arc<std::sync::Mutex<(T, StreamState)>>>>, Infallible>
[INFO] [stdout]   --> src/lib.rs:63:21
[INFO] [stdout]    |
[INFO] [stdout] 63 |                     Ok(Async::Ready(Some(self.content.clone())))
[INFO] [stdout]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/lib.rs:108:21
[INFO] [stdout]     |
[INFO] [stdout] 108 |         pub fn lock(&self) -> WatchedVariableAccessor<T> {
[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] 108 |         pub fn lock(&self) -> WatchedVariableAccessor<'_, T> {
[INFO] [stdout]     |                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `futures-promises` (lib) due to 6 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `futures-promises` (lib test) due to 6 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "98751dd8fde6190eae93f1badf82cbc78b88ceef72866262115eba961415b129", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98751dd8fde6190eae93f1badf82cbc78b88ceef72866262115eba961415b129", kill_on_drop: false }`
[INFO] [stdout] 98751dd8fde6190eae93f1badf82cbc78b88ceef72866262115eba961415b129
