[INFO] fetching crate klu_core 0.2.1...
[INFO] checking klu_core-0.2.1 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate klu_core 0.2.1 into /workspace/builds/worker-50/source
[INFO] validating manifest of crates.io crate klu_core 0.2.1 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate klu_core 0.2.1
[INFO] finished tweaking crates.io crate klu_core 0.2.1
[INFO] tweaked toml for crates.io crate klu_core 0.2.1 written to /workspace/builds/worker-50/source/Cargo.toml
[INFO] crate crates.io crate klu_core 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 804f83eae44cac8f2480fd95863db068b2a547b3af67d6eb081ea04bbc233360
[INFO] running `Command { std: "docker" "start" "-a" "804f83eae44cac8f2480fd95863db068b2a547b3af67d6eb081ea04bbc233360", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "804f83eae44cac8f2480fd95863db068b2a547b3af67d6eb081ea04bbc233360", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "804f83eae44cac8f2480fd95863db068b2a547b3af67d6eb081ea04bbc233360", kill_on_drop: false }`
[INFO] [stdout] 804f83eae44cac8f2480fd95863db068b2a547b3af67d6eb081ea04bbc233360
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d663af5094130c0aa12a82de28dcaf22d667f7f4271ca057893198f47a277aa
[INFO] running `Command { std: "docker" "start" "-a" "0d663af5094130c0aa12a82de28dcaf22d667f7f4271ca057893198f47a277aa", kill_on_drop: false }`
[INFO] [stderr]     Checking klu_core v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `headersize`
[INFO] [stdout]   --> src/read/mod.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     headersize: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `filesize`
[INFO] [stdout]   --> src/read/mod.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     filesize: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `headersize`
[INFO] [stdout]   --> src/read/mod.rs:78:5
[INFO] [stdout]    |
[INFO] [stdout] 78 |     headersize: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `filesize`
[INFO] [stdout]   --> src/read/mod.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     filesize: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `klu`
[INFO] [stdout]  --> examples/r_exists.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | extern crate klu;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `klu_core` due to 2 previous errors
[INFO] [stdout] warning: unused import: `std::io::prelude::*`
[INFO] [stdout]  --> examples/read_file.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::prelude::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0d663af5094130c0aa12a82de28dcaf22d667f7f4271ca057893198f47a277aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d663af5094130c0aa12a82de28dcaf22d667f7f4271ca057893198f47a277aa", kill_on_drop: false }`
[INFO] [stdout] 0d663af5094130c0aa12a82de28dcaf22d667f7f4271ca057893198f47a277aa