[INFO] fetching crate printio 0.2.2...
[INFO] checking printio-0.2.2 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate printio 0.2.2 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate printio 0.2.2
[INFO] finished tweaking crates.io crate printio 0.2.2
[INFO] tweaked toml for crates.io crate printio 0.2.2 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate printio 0.2.2 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] 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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] dfaa1d81cbbe9d74872a2efc9d48828d5cc8ace54cbfe710be956f54709dc455
[INFO] running `Command { std: "docker" "start" "-a" "dfaa1d81cbbe9d74872a2efc9d48828d5cc8ace54cbfe710be956f54709dc455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dfaa1d81cbbe9d74872a2efc9d48828d5cc8ace54cbfe710be956f54709dc455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dfaa1d81cbbe9d74872a2efc9d48828d5cc8ace54cbfe710be956f54709dc455", kill_on_drop: false }`
[INFO] [stdout] dfaa1d81cbbe9d74872a2efc9d48828d5cc8ace54cbfe710be956f54709dc455
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] dce61028d0ad7c07d8af60733181be70898d30e2c794792a3976c96f502de5d3
[INFO] running `Command { std: "docker" "start" "-a" "dce61028d0ad7c07d8af60733181be70898d30e2c794792a3976c96f502de5d3", kill_on_drop: false }`
[INFO] [stderr]     Checking printio v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/printwriter.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 |             label: "".parse().unwrap(),
[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<String, Infallible>
[INFO] [stdout]   --> src/printwriter.rs:42:20
[INFO] [stdout]    |
[INFO] [stdout] 42 |             label: "".parse().unwrap(),
[INFO] [stdout]    |                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/printreader.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 |             label: "".parse().unwrap(),
[INFO] [stdout]    |                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/printreader.rs:44:20
[INFO] [stdout]    |
[INFO] [stdout] 44 |             label: "".parse().unwrap(),
[INFO] [stdout]    |                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `printio` (lib) due to 4 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<String, Infallible>
[INFO] [stdout]   --> src/printwriter.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 |             label: "".parse().unwrap(),
[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<String, Infallible>
[INFO] [stdout]   --> src/printwriter.rs:42:20
[INFO] [stdout]    |
[INFO] [stdout] 42 |             label: "".parse().unwrap(),
[INFO] [stdout]    |                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/printreader.rs:20:20
[INFO] [stdout]    |
[INFO] [stdout] 20 |             label: "".parse().unwrap(),
[INFO] [stdout]    |                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/printreader.rs:44:20
[INFO] [stdout]    |
[INFO] [stdout] 44 |             label: "".parse().unwrap(),
[INFO] [stdout]    |                    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `printio` (lib test) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "dce61028d0ad7c07d8af60733181be70898d30e2c794792a3976c96f502de5d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dce61028d0ad7c07d8af60733181be70898d30e2c794792a3976c96f502de5d3", kill_on_drop: false }`
[INFO] [stdout] dce61028d0ad7c07d8af60733181be70898d30e2c794792a3976c96f502de5d3