[INFO] fetching crate libgitmail 0.1.0...
[INFO] checking libgitmail-0.1.0 against try#0611f7de057c584b8771102fde7aed6c70c71d3b for pr-146440
[INFO] extracting crate libgitmail 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate libgitmail 0.1.0
[INFO] finished tweaking crates.io crate libgitmail 0.1.0
[INFO] tweaked toml for crates.io crate libgitmail 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate libgitmail 0.1.0 on toolchain 0611f7de057c584b8771102fde7aed6c70c71d3b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "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" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 37 packages to latest compatible versions
[INFO] [stderr]       Adding mailparse v0.10.4 (available: v0.16.1)
[INFO] [stderr]       Adding nom v5.1.3 (available: v8.0.0)
[INFO] [stderr]       Adding quickcheck v0.9.2 (available: v1.1.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7607f7eef35d71fc91bd82c3d3933480fabf7db35c4e8d66a20a8ea85da7955
[INFO] running `Command { std: "docker" "start" "-a" "a7607f7eef35d71fc91bd82c3d3933480fabf7db35c4e8d66a20a8ea85da7955", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7607f7eef35d71fc91bd82c3d3933480fabf7db35c4e8d66a20a8ea85da7955", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7607f7eef35d71fc91bd82c3d3933480fabf7db35c4e8d66a20a8ea85da7955", kill_on_drop: false }`
[INFO] [stdout] a7607f7eef35d71fc91bd82c3d3933480fabf7db35c4e8d66a20a8ea85da7955
[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" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0611f7de057c584b8771102fde7aed6c70c71d3b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 37c2905d4a292a25f171472549c8ebb8649facd21011c96aa2efcee82280c63e
[INFO] running `Command { std: "docker" "start" "-a" "37c2905d4a292a25f171472549c8ebb8649facd21011c96aa2efcee82280c63e", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling lexical-core v0.7.6
[INFO] [stderr]     Checking base64 v0.22.1
[INFO] [stderr]     Checking quoted_printable v0.4.8
[INFO] [stderr]    Compiling nom v5.1.3
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking charset v0.1.5
[INFO] [stderr]     Checking mailparse v0.10.4
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking aho-corasick v1.1.4
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]     Checking libgitmail v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/patch/mod.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |   Multi(Vec<String>),
[INFO] [stdout]    |   ----- ^^^^^^^^^^^
[INFO] [stdout]    |   |
[INFO] [stdout]    |   field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 29 -   Multi(Vec<String>),
[INFO] [stdout] 29 +   Multi(()),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `PatchSet` is never constructed
[INFO] [stdout]  --> src/set.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct PatchSet<'maildir> {
[INFO] [stdout]   |            ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this `pub` struct has private fields, no public constructor, and is not otherwise reachable through the external API, so consider providing a public constructor or removing it
[INFO] [stdout]   = note: `#[deny(unused_unconstructable_pub_struct)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `libgitmail` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "37c2905d4a292a25f171472549c8ebb8649facd21011c96aa2efcee82280c63e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "37c2905d4a292a25f171472549c8ebb8649facd21011c96aa2efcee82280c63e", kill_on_drop: false }`
[INFO] [stdout] 37c2905d4a292a25f171472549c8ebb8649facd21011c96aa2efcee82280c63e
