[INFO] fetching crate medina 0.0.2-alpha.3...
[INFO] checking medina-0.0.2-alpha.3 against try#f6e2f78768c57172b99c3e85892f867894dc7e30 for pr-75502
[INFO] extracting crate medina 0.0.2-alpha.3 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate medina 0.0.2-alpha.3 on toolchain f6e2f78768c57172b99c3e85892f867894dc7e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate medina 0.0.2-alpha.3
[INFO] finished tweaking crates.io crate medina 0.0.2-alpha.3
[INFO] tweaked toml for crates.io crate medina 0.0.2-alpha.3 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate medina 0.0.2-alpha.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded async-channel v1.4.0
[INFO] [stderr]   Downloaded plum v0.1.4
[INFO] [stderr]   Downloaded event-listener v2.3.3
[INFO] [stderr]   Downloaded futures-lite v0.1.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 99095b07c397b753406904b75f3b9057c312e55c92076e9277a39cf30b37aca8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "99095b07c397b753406904b75f3b9057c312e55c92076e9277a39cf30b37aca8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "99095b07c397b753406904b75f3b9057c312e55c92076e9277a39cf30b37aca8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99095b07c397b753406904b75f3b9057c312e55c92076e9277a39cf30b37aca8", kill_on_drop: false }`
[INFO] [stdout] 99095b07c397b753406904b75f3b9057c312e55c92076e9277a39cf30b37aca8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+f6e2f78768c57172b99c3e85892f867894dc7e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f4c554c1309025ac4072022f4e572ad011304f080173aa3c27c32e6b61ef0fa3
[INFO] running `Command { std: "docker" "start" "-a" "f4c554c1309025ac4072022f4e572ad011304f080173aa3c27c32e6b61ef0fa3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.19
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking once_cell v1.4.0
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]     Checking event-listener v2.3.3
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking async-mutex v1.1.5
[INFO] [stderr]     Checking plum v0.1.4
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling async-trait v0.1.36
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking medina v0.0.2-alpha.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::time::SystemTime`
[INFO] [stdout]  --> src/crawler_runner.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::SystemTime;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::SystemTime`
[INFO] [stdout]  --> src/crawler_runner.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::time::SystemTime;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `internal`
[INFO] [stdout]   --> src/crawler_runner.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     internal: (Mutex<Crawler>, Event),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `task_runner`
[INFO] [stdout]   --> src/crawler_runner.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     task_runner: (Mutex<TaskRunner>, Event),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `item_count`
[INFO] [stdout]   --> src/crawler_runner.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     item_count: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `internal`
[INFO] [stdout]   --> src/crawler_runner.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     internal: (Mutex<Crawler>, Event),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `task_runner`
[INFO] [stdout]   --> src/crawler_runner.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     task_runner: (Mutex<TaskRunner>, Event),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `item_count`
[INFO] [stdout]   --> src/crawler_runner.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     item_count: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `tokio`
[INFO] [stdout]   --> examples/fake_page_tokio.rs:35:3
[INFO] [stdout]    |
[INFO] [stdout] 35 | #[tokio::main]
[INFO] [stdout]    |   ^^^^^ use of undeclared type or module `tokio`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `async_std`
[INFO] [stdout]  --> examples/fake_page_async_std.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use async_std::task;
[INFO] [stdout]   |     ^^^^^^^^^ use of undeclared type or module `async_std`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `spawn` found for struct `medina::CrawlerRunner` in the current scope
[INFO] [stdout]   --> examples/fake_page_tokio.rs:46:10
[INFO] [stdout]    |
[INFO] [stdout] 46 |         .spawn()
[INFO] [stdout]    |          ^^^^^ method not found in `medina::CrawlerRunner`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `main` has invalid return type `impl std::future::Future`
[INFO] [stdout]   --> examples/fake_page_tokio.rs:36:17
[INFO] [stdout]    |
[INFO] [stdout] 36 | async fn main() {
[INFO] [stdout]    |                 ^ `main` can only return types that implement `std::process::Termination`
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using `()`, or a `Result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0752]: `main` function is not allowed to be `async`
[INFO] [stdout]   --> examples/fake_page_tokio.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | async fn main() {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0433, E0599, E0752.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `medina`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0599]: no method named `spawn` found for struct `medina::CrawlerRunner` in the current scope
[INFO] [stdout]   --> examples/fake_page_async_std.rs:47:14
[INFO] [stdout]    |
[INFO] [stdout] 47 |             .spawn()
[INFO] [stdout]    |              ^^^^^ method not found in `medina::CrawlerRunner`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f4c554c1309025ac4072022f4e572ad011304f080173aa3c27c32e6b61ef0fa3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4c554c1309025ac4072022f4e572ad011304f080173aa3c27c32e6b61ef0fa3", kill_on_drop: false }`
[INFO] [stdout] f4c554c1309025ac4072022f4e572ad011304f080173aa3c27c32e6b61ef0fa3