[INFO] cloning repository https://github.com/jacek-kurlit/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jacek-kurlit/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacek-kurlit%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacek-kurlit%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dde4eb92ab77acda524b88108fb0c06fb23864c5
[INFO] testing jacek-kurlit/learning-rust against 1.90.0 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacek-kurlit%2Flearning-rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/jacek-kurlit/learning-rust
[INFO] finished tweaking git repo https://github.com/jacek-kurlit/learning-rust
[INFO] tweaked toml for git repo https://github.com/jacek-kurlit/learning-rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jacek-kurlit/learning-rust on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jacek-kurlit/learning-rust 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" "+1.90.0" "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-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d6072d1a8415c35f11d427936283fab296550156a4c22998e0e4e81847c0f0dc
[INFO] running `Command { std: "docker" "start" "-a" "d6072d1a8415c35f11d427936283fab296550156a4c22998e0e4e81847c0f0dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d6072d1a8415c35f11d427936283fab296550156a4c22998e0e4e81847c0f0dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6072d1a8415c35f11d427936283fab296550156a4c22998e0e4e81847c0f0dc", kill_on_drop: false }`
[INFO] [stdout] d6072d1a8415c35f11d427936283fab296550156a4c22998e0e4e81847c0f0dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e02f87c1a422f3a4d888c94403a3b270ceb571479f6346282c4a17a88190ce61
[INFO] running `Command { std: "docker" "start" "-a" "e02f87c1a422f3a4d888c94403a3b270ceb571479f6346282c4a17a88190ce61", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected `{`, found `}`
[INFO] [stdout]   --> src/topics/async_await.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 64 |           while while let Ok(stream) = accept.wait  {
[INFO] [stdout]    |  _________-----_-
[INFO] [stdout]    | |         |
[INFO] [stdout]    | |         while parsing the body of this `while` expression
[INFO] [stdout] ...  |
[INFO] [stdout] 72 | |         }
[INFO] [stdout]    | |_________- this `while` condition successfully parsed
[INFO] [stdout] 73 |       });
[INFO] [stdout]    |       ^ expected `{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected item after doc comment
[INFO] [stdout]    --> src/topics/async_await.rs:107:1
[INFO] [stdout]     |
[INFO] [stdout] 103 | / /// What is the difference between std Mutex and tokio Mutex?
[INFO] [stdout] 104 | | /// tokio Mutex is async aware and std Mutex is not
[INFO] [stdout] 105 | | /// std Mutex simply blocks so using it between .await may cause dead locks
[INFO] [stdout] 106 | | /// On the other hand tokio Mutex is much more complex and may need additional time to aquire and
[INFO] [stdout]     | |_________________________________________________________________________________________________- other attributes here
[INFO] [stdout] 107 |   /// unlock mutex
[INFO] [stdout]     |   ^^^^^^^^^^^^^^^^ this doc comment doesn't document anything
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(dropck_eyepatch)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learning_rust` (lib) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "e02f87c1a422f3a4d888c94403a3b270ceb571479f6346282c4a17a88190ce61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e02f87c1a422f3a4d888c94403a3b270ceb571479f6346282c4a17a88190ce61", kill_on_drop: false }`
[INFO] [stdout] e02f87c1a422f3a4d888c94403a3b270ceb571479f6346282c4a17a88190ce61