[INFO] fetching crate embedded-nano-mesh-linux-io 0.1.0...
[INFO] checking embedded-nano-mesh-linux-io-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate embedded-nano-mesh-linux-io 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate embedded-nano-mesh-linux-io 0.1.0
[INFO] finished tweaking crates.io crate embedded-nano-mesh-linux-io 0.1.0
[INFO] tweaked toml for crates.io crate embedded-nano-mesh-linux-io 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate embedded-nano-mesh-linux-io 0.1.0 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 36 packages to latest compatible versions
[INFO] [stderr]       Adding core-foundation v0.10.0 (available: v0.10.1)
[INFO] [stderr]       Adding embedded-io v0.6.1 (available: v0.7.1)
[INFO] [stderr]       Adding quote v1.0.40 (available: v1.0.42)
[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] ab08b1bf2c97eb306d9edb9f19c9211899a8c57ce95f4e4573eea7293c79d25d
[INFO] running `Command { std: "docker" "start" "-a" "ab08b1bf2c97eb306d9edb9f19c9211899a8c57ce95f4e4573eea7293c79d25d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ab08b1bf2c97eb306d9edb9f19c9211899a8c57ce95f4e4573eea7293c79d25d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ab08b1bf2c97eb306d9edb9f19c9211899a8c57ce95f4e4573eea7293c79d25d", kill_on_drop: false }`
[INFO] [stdout] ab08b1bf2c97eb306d9edb9f19c9211899a8c57ce95f4e4573eea7293c79d25d
[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] 0f4d60abccdcc2f46d909289235da7e968f88191a0249560f13db1b9973de2a8
[INFO] running `Command { std: "docker" "start" "-a" "0f4d60abccdcc2f46d909289235da7e968f88191a0249560f13db1b9973de2a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking unicode-ident v1.0.22
[INFO] [stderr]     Checking ufmt-write v0.1.0
[INFO] [stderr]    Compiling libudev-sys v0.1.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.103
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]     Checking libc v0.2.177
[INFO] [stderr]    Compiling syn v2.0.110
[INFO] [stderr]     Checking nix v0.26.4
[INFO] [stderr]     Checking libudev v0.3.0
[INFO] [stderr]    Compiling thiserror-impl v2.0.17
[INFO] [stderr]     Checking thiserror v2.0.17
[INFO] [stderr]     Checking unescaper v0.1.6
[INFO] [stderr]     Checking serialport v4.8.1
[INFO] [stderr]    Compiling ufmt-macros v0.3.0
[INFO] [stderr]     Checking ufmt v0.2.0
[INFO] [stderr]     Checking embedded-nano-mesh-linux-io v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:24:59
[INFO] [stdout]    |
[INFO] [stdout] 24 |       fn read_ready(&mut self) -> Result<bool, Self::Error> {
[INFO] [stdout]    |  ___________________________________________________________^
[INFO] [stdout] 25 | |         if self.inner_byte_cache.is_some() {
[INFO] [stdout] 26 | |             return Ok(true);
[INFO] [stdout] ...  |
[INFO] [stdout] 39 | |     }
[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<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |             return Ok(true);
[INFO] [stdout]    |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 | /         match self.serial.read(&mut read_buf) {
[INFO] [stdout] 32 | |             Ok(0) | Err(_) => Ok(false),
[INFO] [stdout] 33 | |             Ok(_) => {
[INFO] [stdout] 34 | |                 self.inner_byte_cache
[INFO] [stdout] ...  |
[INFO] [stdout] 38 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:32:31
[INFO] [stdout]    |
[INFO] [stdout] 32 |             Ok(0) | Err(_) => Ok(false),
[INFO] [stdout]    |                               ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:33:22
[INFO] [stdout]    |
[INFO] [stdout] 33 |               Ok(_) => {
[INFO] [stdout]    |  ______________________^
[INFO] [stdout] 34 | |                 self.inner_byte_cache
[INFO] [stdout] 35 | |                     .replace(*read_buf.first().unwrap_or(&0));
[INFO] [stdout] 36 | |                 Ok(true)
[INFO] [stdout] 37 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:36:17
[INFO] [stdout]    |
[INFO] [stdout] 36 |                 Ok(true)
[INFO] [stdout]    |                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `embedded-nano-mesh-linux-io` (lib) due to 13 previous errors
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:43:70
[INFO] [stdout]    |
[INFO] [stdout] 43 |       fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]    |  ______________________________________________________________________^
[INFO] [stdout] 44 | |         let mut red_count = usize::default();
[INFO] [stdout] 45 | |
[INFO] [stdout] 46 | |         for read_buf_byte in buf.iter_mut() {
[INFO] [stdout] ...  |
[INFO] [stdout] 58 | |         Ok(red_count)
[INFO] [stdout] 59 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:51:23
[INFO] [stdout]    |
[INFO] [stdout] 51 |                 match self.read_ready() {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Ok(red_count)
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:63:67
[INFO] [stdout]    |
[INFO] [stdout] 63 |       fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]    |  ___________________________________________________________________^
[INFO] [stdout] 64 | |         match self.serial.write(buf) {
[INFO] [stdout] 65 | |             Ok(_) => Ok(buf.len()),
[INFO] [stdout] 66 | |             _ => Ok(0),
[INFO] [stdout] 67 | |         }
[INFO] [stdout] 68 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 | /         match self.serial.write(buf) {
[INFO] [stdout] 65 | |             Ok(_) => Ok(buf.len()),
[INFO] [stdout] 66 | |             _ => Ok(0),
[INFO] [stdout] 67 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:65:22
[INFO] [stdout]    |
[INFO] [stdout] 65 |             Ok(_) => Ok(buf.len()),
[INFO] [stdout]    |                      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:66:18
[INFO] [stdout]    |
[INFO] [stdout] 66 |             _ => Ok(0),
[INFO] [stdout]    |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:24:59
[INFO] [stdout]    |
[INFO] [stdout] 24 |       fn read_ready(&mut self) -> Result<bool, Self::Error> {
[INFO] [stdout]    |  ___________________________________________________________^
[INFO] [stdout] 25 | |         if self.inner_byte_cache.is_some() {
[INFO] [stdout] 26 | |             return Ok(true);
[INFO] [stdout] ...  |
[INFO] [stdout] 39 | |     }
[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<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:26:20
[INFO] [stdout]    |
[INFO] [stdout] 26 |             return Ok(true);
[INFO] [stdout]    |                    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 | /         match self.serial.read(&mut read_buf) {
[INFO] [stdout] 32 | |             Ok(0) | Err(_) => Ok(false),
[INFO] [stdout] 33 | |             Ok(_) => {
[INFO] [stdout] 34 | |                 self.inner_byte_cache
[INFO] [stdout] ...  |
[INFO] [stdout] 38 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:32:31
[INFO] [stdout]    |
[INFO] [stdout] 32 |             Ok(0) | Err(_) => Ok(false),
[INFO] [stdout]    |                               ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:33:22
[INFO] [stdout]    |
[INFO] [stdout] 33 |               Ok(_) => {
[INFO] [stdout]    |  ______________________^
[INFO] [stdout] 34 | |                 self.inner_byte_cache
[INFO] [stdout] 35 | |                     .replace(*read_buf.first().unwrap_or(&0));
[INFO] [stdout] 36 | |                 Ok(true)
[INFO] [stdout] 37 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:36:17
[INFO] [stdout]    |
[INFO] [stdout] 36 |                 Ok(true)
[INFO] [stdout]    |                 ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:43:70
[INFO] [stdout]    |
[INFO] [stdout] 43 |       fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]    |  ______________________________________________________________________^
[INFO] [stdout] 44 | |         let mut red_count = usize::default();
[INFO] [stdout] 45 | |
[INFO] [stdout] 46 | |         for read_buf_byte in buf.iter_mut() {
[INFO] [stdout] ...  |
[INFO] [stdout] 58 | |         Ok(red_count)
[INFO] [stdout] 59 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/lib.rs:51:23
[INFO] [stdout]    |
[INFO] [stdout] 51 |                 match self.read_ready() {
[INFO] [stdout]    |                       ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:58:9
[INFO] [stdout]    |
[INFO] [stdout] 58 |         Ok(red_count)
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:63:67
[INFO] [stdout]    |
[INFO] [stdout] 63 |       fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]    |  ___________________________________________________________________^
[INFO] [stdout] 64 | |         match self.serial.write(buf) {
[INFO] [stdout] 65 | |             Ok(_) => Ok(buf.len()),
[INFO] [stdout] 66 | |             _ => Ok(0),
[INFO] [stdout] 67 | |         }
[INFO] [stdout] 68 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:64:9
[INFO] [stdout]    |
[INFO] [stdout] 64 | /         match self.serial.write(buf) {
[INFO] [stdout] 65 | |             Ok(_) => Ok(buf.len()),
[INFO] [stdout] 66 | |             _ => Ok(0),
[INFO] [stdout] 67 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:65:22
[INFO] [stdout]    |
[INFO] [stdout] 65 |             Ok(_) => Ok(buf.len()),
[INFO] [stdout]    |                      ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/lib.rs:66:18
[INFO] [stdout]    |
[INFO] [stdout] 66 |             _ => Ok(0),
[INFO] [stdout]    |                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `embedded-nano-mesh-linux-io` (lib test) due to 13 previous errors
[INFO] running `Command { std: "docker" "inspect" "0f4d60abccdcc2f46d909289235da7e968f88191a0249560f13db1b9973de2a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f4d60abccdcc2f46d909289235da7e968f88191a0249560f13db1b9973de2a8", kill_on_drop: false }`
[INFO] [stdout] 0f4d60abccdcc2f46d909289235da7e968f88191a0249560f13db1b9973de2a8