[INFO] fetching crate mdview 0.1.1...
[INFO] checking mdview-0.1.1 against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] extracting crate mdview 0.1.1 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate mdview 0.1.1 on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mdview 0.1.1
[INFO] finished tweaking crates.io crate mdview 0.1.1
[INFO] tweaked toml for crates.io crate mdview 0.1.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate crates.io crate mdview 0.1.1 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" "+b0696a5160711c068cb1f01b7437db7990d15750" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded chunked_transfer v1.2.0
[INFO] [stderr]   Downloaded tiny_http v0.7.0
[INFO] [stderr]   Downloaded structopt-derive v0.4.10
[INFO] [stderr]   Downloaded structopt v0.3.17
[INFO] [stderr]   Downloaded ispell v0.3.1
[INFO] [stderr]   Downloaded ascii v1.0.0
[INFO] [stderr]   Downloaded syn v1.0.39
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 46544a0041b5d510d9aec60e9f124420e9d3d9b93dfe237e2bc6d32f01947ce6
[INFO] running `Command { std: "docker" "start" "-a" "46544a0041b5d510d9aec60e9f124420e9d3d9b93dfe237e2bc6d32f01947ce6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "46544a0041b5d510d9aec60e9f124420e9d3d9b93dfe237e2bc6d32f01947ce6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46544a0041b5d510d9aec60e9f124420e9d3d9b93dfe237e2bc6d32f01947ce6", kill_on_drop: false }`
[INFO] [stdout] 46544a0041b5d510d9aec60e9f124420e9d3d9b93dfe237e2bc6d32f01947ce6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85e19fdf7e1fe2e31a5c58d740f37aa6d8510c44a15a31cae7f4d591562274e5
[INFO] running `Command { std: "docker" "start" "-a" "85e19fdf7e1fe2e31a5c58d740f37aa6d8510c44a15a31cae7f4d591562274e5", kill_on_drop: false }`
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.76
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]     Checking tinyvec v0.3.4
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]     Checking unicode-normalization v0.1.13
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling pulldown-cmark v0.8.0
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking ascii v1.0.0
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking chunked_transfer v1.2.0
[INFO] [stderr]     Checking ispell v0.3.1
[INFO] [stderr]     Checking webbrowser v0.5.5
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking tiny_http v0.7.0
[INFO] [stderr]    Compiling structopt-derive v0.4.10
[INFO] [stderr]     Checking structopt v0.3.17
[INFO] [stderr]     Checking mdview v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `webbrowser` is imported redundantly
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use webbrowser;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `webbrowser` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `webbrowser` is imported redundantly
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use webbrowser;
[INFO] [stdout]   |     ^^^^^^^^^^ the item `webbrowser` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.98s
[INFO] running `Command { std: "docker" "inspect" "85e19fdf7e1fe2e31a5c58d740f37aa6d8510c44a15a31cae7f4d591562274e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85e19fdf7e1fe2e31a5c58d740f37aa6d8510c44a15a31cae7f4d591562274e5", kill_on_drop: false }`
[INFO] [stdout] 85e19fdf7e1fe2e31a5c58d740f37aa6d8510c44a15a31cae7f4d591562274e5
[ERROR] this task or one of its parent failed!
[ERROR] error sending request for url (https://crater.rust-lang.org/agent-api/record-progress): connection closed before message completed
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.