[INFO] fetching crate piper 0.2.4...
[INFO] checking piper-0.2.4 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate piper 0.2.4 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate piper 0.2.4
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate piper 0.2.4
[INFO] tweaked toml for crates.io crate piper 0.2.4 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate piper 0.2.4 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]      Locking 77 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.4.0 (available: v0.7.0)
[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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 0e192e77083be646a4f1790fcbfc640aca3559209d7c718a1b4941f75279f8d1
[INFO] running `Command { std: "docker" "start" "-a" "0e192e77083be646a4f1790fcbfc640aca3559209d7c718a1b4941f75279f8d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0e192e77083be646a4f1790fcbfc640aca3559209d7c718a1b4941f75279f8d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e192e77083be646a4f1790fcbfc640aca3559209d7c718a1b4941f75279f8d1", kill_on_drop: false }`
[INFO] [stdout] 0e192e77083be646a4f1790fcbfc640aca3559209d7c718a1b4941f75279f8d1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 5f92c110d2fd14d5c8dcf211448a0ad2597ccdb7393c3b358df7a92babc6b3a6
[INFO] running `Command { std: "docker" "start" "-a" "5f92c110d2fd14d5c8dcf211448a0ad2597ccdb7393c3b358df7a92babc6b3a6", kill_on_drop: false }`
[INFO] [stderr]    Compiling zerocopy v0.8.27
[INFO] [stderr]    Compiling zerocopy-derive v0.8.27
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling rustix v1.1.2
[INFO] [stderr]    Compiling libc v0.2.177
[INFO] [stderr]     Checking serde_json v1.0.145
[INFO] [stderr]     Checking regex-automata v0.4.13
[INFO] [stderr]     Checking futures-lite v2.6.1
[INFO] [stderr]     Checking textwrap v0.16.2
[INFO] [stderr]     Checking clap v3.2.25
[INFO] [stderr]     Checking async-channel v2.5.0
[INFO] [stderr]     Checking easy-parallel v3.3.1
[INFO] [stderr]     Checking piper v0.2.4 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<usize, Infallible>
[INFO] [stdout]     --> src/lib.rs:1045:70
[INFO] [stdout]      |
[INFO] [stdout] 1045 |       fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]      |  ______________________________________________________________________^
[INFO] [stdout] 1046 | |         let n = self.0.len().min(buf.len());
[INFO] [stdout] 1047 | |         buf[..n].copy_from_slice(&self.0[..n]);
[INFO] [stdout] 1048 | |         self.0 = &self.0[n..];
[INFO] [stdout] 1049 | |         Ok(n)
[INFO] [stdout] 1050 | |     }
[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:1049:9
[INFO] [stdout]      |
[INFO] [stdout] 1049 |         Ok(n)
[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:1077:67
[INFO] [stdout]      |
[INFO] [stdout] 1077 |       fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
[INFO] [stdout]      |  ___________________________________________________________________^
[INFO] [stdout] 1078 | |         let n = self.0.len().min(buf.len());
[INFO] [stdout] 1079 | |         self.0[..n].copy_from_slice(&buf[..n]);
[INFO] [stdout] ...    |
[INFO] [stdout] 1088 | |         Ok(n)
[INFO] [stdout] 1089 | |     }
[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:1088:9
[INFO] [stdout]      |
[INFO] [stdout] 1088 |         Ok(n)
[INFO] [stdout]      |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `piper` (lib) due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5f92c110d2fd14d5c8dcf211448a0ad2597ccdb7393c3b358df7a92babc6b3a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f92c110d2fd14d5c8dcf211448a0ad2597ccdb7393c3b358df7a92babc6b3a6", kill_on_drop: false }`
[INFO] [stdout] 5f92c110d2fd14d5c8dcf211448a0ad2597ccdb7393c3b358df7a92babc6b3a6