[INFO] fetching crate ncomm-update-clients-and-servers 1.1.4...
[INFO] checking ncomm-update-clients-and-servers-1.1.4 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate ncomm-update-clients-and-servers 1.1.4 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate ncomm-update-clients-and-servers 1.1.4
[INFO] finished tweaking crates.io crate ncomm-update-clients-and-servers 1.1.4
[INFO] tweaked toml for crates.io crate ncomm-update-clients-and-servers 1.1.4 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate ncomm-update-clients-and-servers 1.1.4 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]     Updating crates.io index
[INFO] [stderr]      Locking 23 packages to latest compatible versions
[INFO] [stderr]       Adding embedded-io v0.6.1 (available: v0.7.1)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 6ffd8d89e60f7fbc12673a742b0647263b2c5d01d97c79589908587dcc9d3016
[INFO] running `Command { std: "docker" "start" "-a" "6ffd8d89e60f7fbc12673a742b0647263b2c5d01d97c79589908587dcc9d3016", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ffd8d89e60f7fbc12673a742b0647263b2c5d01d97c79589908587dcc9d3016", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ffd8d89e60f7fbc12673a742b0647263b2c5d01d97c79589908587dcc9d3016", kill_on_drop: false }`
[INFO] [stdout] 6ffd8d89e60f7fbc12673a742b0647263b2c5d01d97c79589908587dcc9d3016
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 03d0d781cf66f5f0df21b44fd1ae4bbb8f24b226a747df9634260f5c6ecf822e
[INFO] running `Command { std: "docker" "start" "-a" "03d0d781cf66f5f0df21b44fd1ae4bbb8f24b226a747df9634260f5c6ecf822e", kill_on_drop: false }`
[INFO] [stderr]     Checking getrandom v0.2.16
[INFO] [stderr]     Checking crossbeam-queue v0.3.12
[INFO] [stderr]     Checking crossbeam-channel v0.5.15
[INFO] [stderr]     Checking ncomm-utils v1.1.4
[INFO] [stderr]     Checking ncomm-core v1.1.4
[INFO] [stderr]     Checking crossbeam-deque v0.8.6
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking crossbeam v0.8.4
[INFO] [stderr]     Checking ncomm-update-clients-and-servers v1.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Updt)>, Infallible>
[INFO] [stdout]   --> src/local.rs:37:97
[INFO] [stdout]    |
[INFO] [stdout] 37 |       fn poll_for_update(&mut self) -> Result<Option<(Self::Request, Self::Update)>, Self::Error> {
[INFO] [stdout]    |  _________________________________________________________________________________________________^
[INFO] [stdout] 38 | |         match self.update_rx.try_recv() {
[INFO] [stdout] 39 | |             Ok(update) => Ok(Some(update)),
[INFO] [stdout] 40 | |             Err(_) => Ok(None),
[INFO] [stdout] 41 | |         }
[INFO] [stdout] 42 | |     }
[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<Option<(Req, Updt)>, Infallible>
[INFO] [stdout]   --> src/local.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 | /         match self.update_rx.try_recv() {
[INFO] [stdout] 39 | |             Ok(update) => Ok(Some(update)),
[INFO] [stdout] 40 | |             Err(_) => Ok(None),
[INFO] [stdout] 41 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Updt)>, Infallible>
[INFO] [stdout]   --> src/local.rs:39:27
[INFO] [stdout]    |
[INFO] [stdout] 39 |             Ok(update) => Ok(Some(update)),
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Updt)>, Infallible>
[INFO] [stdout]   --> src/local.rs:40:23
[INFO] [stdout]    |
[INFO] [stdout] 40 |             Err(_) => Ok(None),
[INFO] [stdout]    |                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(Req, Updt), Infallible>
[INFO] [stdout]   --> src/local.rs:47:26
[INFO] [stdout]    |
[INFO] [stdout] 47 |             updates.push(Ok(update));
[INFO] [stdout]    |                          ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Res)>, Infallible>
[INFO] [stdout]   --> src/local.rs:54:71
[INFO] [stdout]    |
[INFO] [stdout] 54 |       ) -> Result<Option<(Self::Request, Self::Response)>, Self::Error> {
[INFO] [stdout]    |  _______________________________________________________________________^
[INFO] [stdout] 55 | |         match self.response_rx.try_recv() {
[INFO] [stdout] 56 | |             Ok(response) => Ok(Some(response)),
[INFO] [stdout] 57 | |             Err(_) => Ok(None),
[INFO] [stdout] 58 | |         }
[INFO] [stdout] 59 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Res)>, Infallible>
[INFO] [stdout]   --> src/local.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 | /         match self.response_rx.try_recv() {
[INFO] [stdout] 56 | |             Ok(response) => Ok(Some(response)),
[INFO] [stdout] 57 | |             Err(_) => Ok(None),
[INFO] [stdout] 58 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Res)>, Infallible>
[INFO] [stdout]   --> src/local.rs:56:29
[INFO] [stdout]    |
[INFO] [stdout] 56 |             Ok(response) => Ok(Some(response)),
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(Req, Res)>, Infallible>
[INFO] [stdout]   --> src/local.rs:57:23
[INFO] [stdout]    |
[INFO] [stdout] 57 |             Err(_) => Ok(None),
[INFO] [stdout]    |                       ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(Req, Res), Infallible>
[INFO] [stdout]   --> src/local.rs:64:28
[INFO] [stdout]    |
[INFO] [stdout] 64 |             responses.push(Ok(response));
[INFO] [stdout]    |                            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(K, Req)>, Infallible>
[INFO] [stdout]    --> src/local.rs:116:95
[INFO] [stdout]     |
[INFO] [stdout] 116 |       fn poll_for_request(&mut self) -> Result<Option<(Self::Key, Self::Request)>, Self::Error> {
[INFO] [stdout]     |  _______________________________________________________________________________________________^
[INFO] [stdout] 117 | |         for (k, (rx, _, _)) in self.client_map.iter() {
[INFO] [stdout] 118 | |             if let Ok(request) = rx.try_recv() {
[INFO] [stdout] 119 | |                 return Ok(Some((k.clone(), request)));
[INFO] [stdout] ...   |
[INFO] [stdout] 122 | |         Ok(None)
[INFO] [stdout] 123 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(K, Req)>, Infallible>
[INFO] [stdout]    --> src/local.rs:119:24
[INFO] [stdout]     |
[INFO] [stdout] 119 |                 return Ok(Some((k.clone(), request)));
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Option<(K, Req)>, Infallible>
[INFO] [stdout]    --> src/local.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |         Ok(None)
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<(K, Req), Infallible>
[INFO] [stdout]    --> src/local.rs:129:31
[INFO] [stdout]     |
[INFO] [stdout] 129 |                 requests.push(Ok((k.clone(), request)));
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ncomm-update-clients-and-servers` (lib) due to 14 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "03d0d781cf66f5f0df21b44fd1ae4bbb8f24b226a747df9634260f5c6ecf822e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03d0d781cf66f5f0df21b44fd1ae4bbb8f24b226a747df9634260f5c6ecf822e", kill_on_drop: false }`
[INFO] [stdout] 03d0d781cf66f5f0df21b44fd1ae4bbb8f24b226a747df9634260f5c6ecf822e
