[INFO] fetching crate embedded-io 0.7.1...
[INFO] checking embedded-io-0.7.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate embedded-io 0.7.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate embedded-io 0.7.1
[INFO] finished tweaking crates.io crate embedded-io 0.7.1
[INFO] tweaked toml for crates.io crate embedded-io 0.7.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate embedded-io 0.7.1 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 crates.io crate embedded-io 0.7.1 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] 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] f0200222941fadfa1d2c1b81c2552936f7978af776306f6e7127b6bbf0777d01
[INFO] running `Command { std: "docker" "start" "-a" "f0200222941fadfa1d2c1b81c2552936f7978af776306f6e7127b6bbf0777d01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f0200222941fadfa1d2c1b81c2552936f7978af776306f6e7127b6bbf0777d01", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0200222941fadfa1d2c1b81c2552936f7978af776306f6e7127b6bbf0777d01", kill_on_drop: false }`
[INFO] [stdout] f0200222941fadfa1d2c1b81c2552936f7978af776306f6e7127b6bbf0777d01
[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] d516938bcc61bba0256dce0e323720df88a5b1a5e02d5ce609024bb21f99961a
[INFO] running `Command { std: "docker" "start" "-a" "d516938bcc61bba0256dce0e323720df88a5b1a5e02d5ce609024bb21f99961a", kill_on_drop: false }`
[INFO] [stderr]     Checking embedded-io v0.7.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:13:70
[INFO] [stdout]    |
[INFO] [stdout] 13 |       fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]    |  ______________________________________________________________________^
[INFO] [stdout] 14 | |         let amt = core::cmp::min(buf.len(), self.len());
[INFO] [stdout] 15 | |         let (a, b) = self.split_at(amt);
[INFO] [stdout] ...  |
[INFO] [stdout] 27 | |         Ok(amt)
[INFO] [stdout] 28 | |     }
[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<usize, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         Ok(amt)
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, Infallible>, usize>
[INFO] [stdout]   --> src/impls/slice_ref.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         self.read(buf)?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         self.read(buf)?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:42:58
[INFO] [stdout]    |
[INFO] [stdout] 42 |       fn fill_buf(&mut self) -> Result<&[u8], Self::Error> {
[INFO] [stdout]    |  __________________________________________________________^
[INFO] [stdout] 43 | |         Ok(*self)
[INFO] [stdout] 44 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |         Ok(*self)
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:54:59
[INFO] [stdout]    |
[INFO] [stdout] 54 |       fn read_ready(&mut self) -> Result<bool, Self::Error> {
[INFO] [stdout]    |  ___________________________________________________________^
[INFO] [stdout] 55 | |         Ok(true)
[INFO] [stdout] 56 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Ok(true)
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `embedded-io` (lib) due to 8 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:13:70
[INFO] [stdout]    |
[INFO] [stdout] 13 |       fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]    |  ______________________________________________________________________^
[INFO] [stdout] 14 | |         let amt = core::cmp::min(buf.len(), self.len());
[INFO] [stdout] 15 | |         let (a, b) = self.split_at(amt);
[INFO] [stdout] ...  |
[INFO] [stdout] 27 | |         Ok(amt)
[INFO] [stdout] 28 | |     }
[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<usize, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         Ok(amt)
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: ControlFlow<Result<Infallible, Infallible>, usize>
[INFO] [stdout]   --> src/impls/slice_ref.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         self.read(buf)?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |         self.read(buf)?;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:42:58
[INFO] [stdout]    |
[INFO] [stdout] 42 |       fn fill_buf(&mut self) -> Result<&[u8], Self::Error> {
[INFO] [stdout]    |  __________________________________________________________^
[INFO] [stdout] 43 | |         Ok(*self)
[INFO] [stdout] 44 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&[u8], Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:43:9
[INFO] [stdout]    |
[INFO] [stdout] 43 |         Ok(*self)
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:54:59
[INFO] [stdout]    |
[INFO] [stdout] 54 |       fn read_ready(&mut self) -> Result<bool, Self::Error> {
[INFO] [stdout]    |  ___________________________________________________________^
[INFO] [stdout] 55 | |         Ok(true)
[INFO] [stdout] 56 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<bool, Infallible>
[INFO] [stdout]   --> src/impls/slice_ref.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Ok(true)
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `embedded-io` (lib test) due to 8 previous errors
[INFO] running `Command { std: "docker" "inspect" "d516938bcc61bba0256dce0e323720df88a5b1a5e02d5ce609024bb21f99961a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d516938bcc61bba0256dce0e323720df88a5b1a5e02d5ce609024bb21f99961a", kill_on_drop: false }`
[INFO] [stdout] d516938bcc61bba0256dce0e323720df88a5b1a5e02d5ce609024bb21f99961a