[INFO] fetching crate windowed-infinity 0.2.0...
[INFO] checking windowed-infinity-0.2.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate windowed-infinity 0.2.0 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate windowed-infinity 0.2.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate windowed-infinity 0.2.0
[INFO] tweaked toml for crates.io crate windowed-infinity 0.2.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate windowed-infinity 0.2.0 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] crate crates.io crate windowed-infinity 0.2.0 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-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] 926f663b3ca7540ef2daccd72cc96f91b895e6a373147ceb539d95020f97272f
[INFO] running `Command { std: "docker" "start" "-a" "926f663b3ca7540ef2daccd72cc96f91b895e6a373147ceb539d95020f97272f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "926f663b3ca7540ef2daccd72cc96f91b895e6a373147ceb539d95020f97272f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "926f663b3ca7540ef2daccd72cc96f91b895e6a373147ceb539d95020f97272f", kill_on_drop: false }`
[INFO] [stdout] 926f663b3ca7540ef2daccd72cc96f91b895e6a373147ceb539d95020f97272f
[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] 4aff8bf7652b1b82d45df4d50eed307263279b54e4f7f83f4d85542c7f2c188c
[INFO] running `Command { std: "docker" "start" "-a" "4aff8bf7652b1b82d45df4d50eed307263279b54e4f7f83f4d85542c7f2c188c", kill_on_drop: false }`
[INFO] [stderr]     Checking embedded-io v0.7.1
[INFO] [stderr]     Checking extra-embedded-io-adapters v0.1.0
[INFO] [stderr]     Checking embedded-io-adapters v0.7.0
[INFO] [stderr]     Checking tee-embedded-io v0.1.0
[INFO] [stderr]     Checking windowed-infinity v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]    --> src/lib.rs:106:67
[INFO] [stdout]     |
[INFO] [stdout] 106 |       fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]     |  ___________________________________________________________________^
[INFO] [stdout] 107 | |         self.write(buf);
[INFO] [stdout] 108 | |         Ok(buf.len())
[INFO] [stdout] 109 | |     }
[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/lib.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         Ok(buf.len())
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `windowed-infinity` (lib) due to 2 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/lib.rs:106:67
[INFO] [stdout]     |
[INFO] [stdout] 106 |       fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]     |  ___________________________________________________________________^
[INFO] [stdout] 107 | |         self.write(buf);
[INFO] [stdout] 108 | |         Ok(buf.len())
[INFO] [stdout] 109 | |     }
[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/lib.rs:108:9
[INFO] [stdout]     |
[INFO] [stdout] 108 |         Ok(buf.len())
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `windowed-infinity` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "4aff8bf7652b1b82d45df4d50eed307263279b54e4f7f83f4d85542c7f2c188c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4aff8bf7652b1b82d45df4d50eed307263279b54e4f7f83f4d85542c7f2c188c", kill_on_drop: false }`
[INFO] [stdout] 4aff8bf7652b1b82d45df4d50eed307263279b54e4f7f83f4d85542c7f2c188c
