[INFO] fetching crate iterators_extended 0.2.0...
[INFO] checking iterators_extended-0.2.0 against try#93086cfebfccb79083c59d0d3b2052944bba643c for pr-146440-1
[INFO] extracting crate iterators_extended 0.2.0 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate iterators_extended 0.2.0
[INFO] finished tweaking crates.io crate iterators_extended 0.2.0
[INFO] tweaked toml for crates.io crate iterators_extended 0.2.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate iterators_extended 0.2.0 on toolchain 93086cfebfccb79083c59d0d3b2052944bba643c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate iterators_extended 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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+93086cfebfccb79083c59d0d3b2052944bba643c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8c20dfce109c3a70aa100d7423dc437d3b69ecc4cc24c1276418c92b7224bd9c
[INFO] running `Command { std: "docker" "start" "-a" "8c20dfce109c3a70aa100d7423dc437d3b69ecc4cc24c1276418c92b7224bd9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8c20dfce109c3a70aa100d7423dc437d3b69ecc4cc24c1276418c92b7224bd9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c20dfce109c3a70aa100d7423dc437d3b69ecc4cc24c1276418c92b7224bd9c", kill_on_drop: false }`
[INFO] [stdout] 8c20dfce109c3a70aa100d7423dc437d3b69ecc4cc24c1276418c92b7224bd9c
[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" "-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" "+93086cfebfccb79083c59d0d3b2052944bba643c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ced6c1779bcf84f711defff5662568b19f23b09efd029d627b3921b8bffa573c
[INFO] running `Command { std: "docker" "start" "-a" "ced6c1779bcf84f711defff5662568b19f23b09efd029d627b3921b8bffa573c", kill_on_drop: false }`
[INFO] [stderr]     Checking iterators_extended v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: struct `InterleaveIterator` is never constructed
[INFO] [stdout]  --> src/interleave.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 2 | struct InterleaveIterator<I, J> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `IntoInterleaveIterator` is never used
[INFO] [stdout]   --> src/interleave.rs:27:7
[INFO] [stdout]    |
[INFO] [stdout] 27 | trait IntoInterleaveIterator: IntoIterator {
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: struct `LoggingIterator` is never constructed
[INFO] [stdout]  --> src/logging.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct LoggingIterator<I: Iterator> {
[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_structs)]` (part of `#[deny(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `IntoLoggingIterator` is never used
[INFO] [stdout]   --> src/logging.rs:22:7
[INFO] [stdout]    |
[INFO] [stdout] 22 | trait IntoLoggingIterator {
[INFO] [stdout]    |       ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `iterators_extended` (lib) due to 1 previous error; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `mapped`
[INFO] [stdout]    --> src/stateful_threaded.rs:203:13
[INFO] [stdout]     |
[INFO] [stdout] 203 |         let mapped = values
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_mapped`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ced6c1779bcf84f711defff5662568b19f23b09efd029d627b3921b8bffa573c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ced6c1779bcf84f711defff5662568b19f23b09efd029d627b3921b8bffa573c", kill_on_drop: false }`
[INFO] [stdout] ced6c1779bcf84f711defff5662568b19f23b09efd029d627b3921b8bffa573c
