[INFO] fetching crate vga-emu 0.5.1...
[INFO] testing vga-emu-0.5.1 against 1.75.0 for beta-1.76-1
[INFO] extracting crate vga-emu 0.5.1 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate vga-emu 0.5.1 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vga-emu 0.5.1
[INFO] finished tweaking crates.io crate vga-emu 0.5.1
[INFO] tweaked toml for crates.io crate vga-emu 0.5.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate vga-emu 0.5.1 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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b51db5c283afd404a3ce66aeeb98aa6990f33df81cccbb34585989b29155a69
[INFO] running `Command { std: "docker" "start" "-a" "3b51db5c283afd404a3ce66aeeb98aa6990f33df81cccbb34585989b29155a69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b51db5c283afd404a3ce66aeeb98aa6990f33df81cccbb34585989b29155a69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b51db5c283afd404a3ce66aeeb98aa6990f33df81cccbb34585989b29155a69", kill_on_drop: false }`
[INFO] [stdout] 3b51db5c283afd404a3ce66aeeb98aa6990f33df81cccbb34585989b29155a69
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eed304c445f46a1c0c63ab753af66b4599ddeab2a051b21441fd29c7211d95cb
[INFO] running `Command { std: "docker" "start" "-a" "eed304c445f46a1c0c63ab753af66b4599ddeab2a051b21441fd29c7211d95cb", kill_on_drop: false }`
[INFO] [stderr]    Compiling parking v2.2.0
[INFO] [stderr]    Compiling futures-core v0.3.29
[INFO] [stderr]    Compiling futures-io v0.3.29
[INFO] [stderr]    Compiling event-listener v2.5.3
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling waker-fn v1.1.1
[INFO] [stderr]    Compiling io-lifetimes v1.0.11
[INFO] [stderr]    Compiling value-bag v1.4.2
[INFO] [stderr]    Compiling rustix v0.38.21
[INFO] [stderr]    Compiling fastrand v1.9.0
[INFO] [stderr]    Compiling rustix v0.37.27
[INFO] [stderr]    Compiling polling v2.8.0
[INFO] [stderr]    Compiling linux-raw-sys v0.4.11
[INFO] [stderr]    Compiling concurrent-queue v2.3.0
[INFO] [stderr]    Compiling async-io v1.13.0
[INFO] [stderr]    Compiling linux-raw-sys v0.3.8
[INFO] [stderr]    Compiling socket2 v0.4.10
[INFO] [stderr]    Compiling async-lock v2.8.0
[INFO] [stderr]    Compiling async-task v4.5.0
[INFO] [stderr]    Compiling log v0.4.20
[INFO] [stderr]    Compiling event-listener v4.0.0
[INFO] [stderr]    Compiling atomic-waker v1.1.2
[INFO] [stderr]    Compiling signal-hook-registry v1.4.1
[INFO] [stderr]    Compiling futures-lite v1.13.0
[INFO] [stderr]    Compiling futures-lite v2.0.1
[INFO] [stderr]    Compiling piper v0.2.1
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling event-listener-strategy v0.4.0
[INFO] [stderr]    Compiling async-channel v1.9.0
[INFO] [stderr]    Compiling event-listener v3.1.0
[INFO] [stderr]    Compiling async-lock v3.1.2
[INFO] [stderr]    Compiling kv-log-macro v1.0.7
[INFO] [stderr]    Compiling blocking v1.4.1
[INFO] [stderr]    Compiling async-executor v1.6.0
[INFO] [stderr]    Compiling async-global-executor v2.3.1
[INFO] [stderr]    Compiling polling v3.3.0
[INFO] [stderr]    Compiling async-io v2.2.1
[INFO] [stderr]    Compiling async-signal v0.2.5
[INFO] [stderr]    Compiling async-process v1.8.1
[INFO] [stderr]    Compiling async-std v1.12.0
[INFO] [stderr]    Compiling vga-emu v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::future::Future`
[INFO] [stdout]  --> src/util.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::future::Future;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `JoinHandle`
[INFO] [stdout]  --> src/util.rs:5:29
[INFO] [stdout]   |
[INFO] [stdout] 5 | use async_std::task::{self, JoinHandle};
[INFO] [stdout]   |                             ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:212:56
[INFO] [stdout]     |
[INFO] [stdout] 212 |     pub fn start(self: Arc<Self>, options: Options) -> Result<(), String> {
[INFO] [stdout]     |            -----                                       ^^^^^^^^^^^^^^^^^^ expected `Result<(), String>`, found `()`
[INFO] [stdout]     |            |
[INFO] [stdout]     |            implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]     |
[INFO] [stdout]     = note:   expected enum `Result<(), String>`
[INFO] [stdout]             found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `vga-emu` (lib) due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "eed304c445f46a1c0c63ab753af66b4599ddeab2a051b21441fd29c7211d95cb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eed304c445f46a1c0c63ab753af66b4599ddeab2a051b21441fd29c7211d95cb", kill_on_drop: false }`
[INFO] [stdout] eed304c445f46a1c0c63ab753af66b4599ddeab2a051b21441fd29c7211d95cb
