[INFO] cloning repository https://github.com/stestagg/escpos-embedded
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/stestagg/escpos-embedded" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstestagg%2Fescpos-embedded", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstestagg%2Fescpos-embedded'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 56e498200a81ac09bf2c7c3a7d27834650b88982
[INFO] checking stestagg/escpos-embedded against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstestagg%2Fescpos-embedded" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/stestagg/escpos-embedded
[INFO] finished tweaking git repo https://github.com/stestagg/escpos-embedded
[INFO] tweaked toml for git repo https://github.com/stestagg/escpos-embedded written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/stestagg/escpos-embedded 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 git repo https://github.com/stestagg/escpos-embedded 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 2f01c6590d4650e4744f6dc14113447fd039bd9511ddaf9308e98a3dfc5e5e4d
[INFO] running `Command { std: "docker" "start" "-a" "2f01c6590d4650e4744f6dc14113447fd039bd9511ddaf9308e98a3dfc5e5e4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2f01c6590d4650e4744f6dc14113447fd039bd9511ddaf9308e98a3dfc5e5e4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f01c6590d4650e4744f6dc14113447fd039bd9511ddaf9308e98a3dfc5e5e4d", kill_on_drop: false }`
[INFO] [stdout] 2f01c6590d4650e4744f6dc14113447fd039bd9511ddaf9308e98a3dfc5e5e4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] b4dcf1a722d12440d030f679d96e5d7727b11df13bdaf754960fb59d7046b2e2
[INFO] running `Command { std: "docker" "start" "-a" "b4dcf1a722d12440d030f679d96e5d7727b11df13bdaf754960fb59d7046b2e2", kill_on_drop: false }`
[INFO] [stderr]     Checking escpos-embedded v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::vec`
[INFO] [stdout]    --> src/lib.rs:520:9
[INFO] [stdout]     |
[INFO] [stdout] 520 |     use std::vec;
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LimitedMockTransport` is never constructed
[INFO] [stdout]    --> src/lib.rs:553:12
[INFO] [stdout]     |
[INFO] [stdout] 553 |     struct LimitedMockTransport {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/lib.rs:559:12
[INFO] [stdout]     |
[INFO] [stdout] 558 |     impl LimitedMockTransport {
[INFO] [stdout]     |     ------------------------- associated function in this implementation
[INFO] [stdout] 559 |         fn new(max: usize) -> Self {
[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:545:74
[INFO] [stdout]     |
[INFO] [stdout] 545 |           fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]     |  __________________________________________________________________________^
[INFO] [stdout] 546 | |             let len = core::cmp::min(buf.len(), self.buffer.len());
[INFO] [stdout] 547 | |             buf[..len].copy_from_slice(&self.buffer[..len]);
[INFO] [stdout] 548 | |             self.buffer.drain(..len);
[INFO] [stdout] 549 | |             Ok(len)
[INFO] [stdout] 550 | |         }
[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:549:13
[INFO] [stdout]     |
[INFO] [stdout] 549 |             Ok(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:580:74
[INFO] [stdout]     |
[INFO] [stdout] 580 |           fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]     |  __________________________________________________________________________^
[INFO] [stdout] 581 | |             let len = core::cmp::min(buf.len(), self.buffer.len());
[INFO] [stdout] 582 | |             buf[..len].copy_from_slice(&self.buffer[..len]);
[INFO] [stdout] 583 | |             self.buffer.drain(..len);
[INFO] [stdout] 584 | |             Ok(len)
[INFO] [stdout] 585 | |         }
[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:584:13
[INFO] [stdout]     |
[INFO] [stdout] 584 |             Ok(len)
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u8, Infallible>
[INFO] [stdout]    --> src/lib.rs:716:22
[INFO] [stdout]     |
[INFO] [stdout] 716 |         let status = printer.paper_status().unwrap();
[INFO] [stdout]     |                      ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `escpos-embedded` (lib test) due to 5 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "b4dcf1a722d12440d030f679d96e5d7727b11df13bdaf754960fb59d7046b2e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b4dcf1a722d12440d030f679d96e5d7727b11df13bdaf754960fb59d7046b2e2", kill_on_drop: false }`
[INFO] [stdout] b4dcf1a722d12440d030f679d96e5d7727b11df13bdaf754960fb59d7046b2e2
