[INFO] cloning repository https://github.com/Yougigun/rust_for_rustaceans
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Yougigun/rust_for_rustaceans" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYougigun%2Frust_for_rustaceans", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYougigun%2Frust_for_rustaceans'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8677dac2ef03217bf2e18a2f90e96bed30bb10c8
[INFO] checking Yougigun/rust_for_rustaceans/8677dac2ef03217bf2e18a2f90e96bed30bb10c8 against try#498fce24f39c1ecbb0abe08824e72162da853341 for pr-129935
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYougigun%2Frust_for_rustaceans" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Yougigun/rust_for_rustaceans on toolchain 498fce24f39c1ecbb0abe08824e72162da853341
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Yougigun/rust_for_rustaceans
[INFO] finished tweaking git repo https://github.com/Yougigun/rust_for_rustaceans
[INFO] tweaked toml for git repo https://github.com/Yougigun/rust_for_rustaceans written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Yougigun/rust_for_rustaceans 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" "+498fce24f39c1ecbb0abe08824e72162da853341" "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
[ERROR] error running command: no output for 300 seconds
[INFO] checking Yougigun/rust_for_rustaceans/8677dac2ef03217bf2e18a2f90e96bed30bb10c8 against try#498fce24f39c1ecbb0abe08824e72162da853341 for pr-129935
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYougigun%2Frust_for_rustaceans" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Yougigun/rust_for_rustaceans on toolchain 498fce24f39c1ecbb0abe08824e72162da853341
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Yougigun/rust_for_rustaceans
[INFO] finished tweaking git repo https://github.com/Yougigun/rust_for_rustaceans
[INFO] tweaked toml for git repo https://github.com/Yougigun/rust_for_rustaceans written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Yougigun/rust_for_rustaceans 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" "+498fce24f39c1ecbb0abe08824e72162da853341" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:96c0aa5895ecf336b730ef27bcdde6e21027415df19888aad3cf1448e5d65d90" "/opt/rustwide/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 97e9ebe0c6b3ef2a2554af6e155bc62002399bc71556037acc4a26d6c396830d
[INFO] running `Command { std: "docker" "start" "-a" "97e9ebe0c6b3ef2a2554af6e155bc62002399bc71556037acc4a26d6c396830d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "97e9ebe0c6b3ef2a2554af6e155bc62002399bc71556037acc4a26d6c396830d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97e9ebe0c6b3ef2a2554af6e155bc62002399bc71556037acc4a26d6c396830d", kill_on_drop: false }`
[INFO] [stdout] 97e9ebe0c6b3ef2a2554af6e155bc62002399bc71556037acc4a26d6c396830d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:96c0aa5895ecf336b730ef27bcdde6e21027415df19888aad3cf1448e5d65d90" "/opt/rustwide/cargo-home/bin/cargo" "+498fce24f39c1ecbb0abe08824e72162da853341" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 963679e7d417a1f9ef97736accb802a223879b4d9efca6500868e035a4e80baa
[INFO] running `Command { std: "docker" "start" "-a" "963679e7d417a1f9ef97736accb802a223879b4d9efca6500868e035a4e80baa", kill_on_drop: false }`
[INFO] [stderr]     Checking listing_1-2 v0.1.0 (/opt/rustwide/workdir/listing_1-2)
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]  --> listing_1-2/src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     x = 43;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0506]: cannot assign to `x` because it is borrowed
[INFO] [stdout]   --> listing_1-2/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout] 7  |     let y = &x;
[INFO] [stdout]    |             -- `x` is borrowed here
[INFO] [stdout] 8  |     // this establishes a second, mutable flow from x:
[INFO] [stdout] 9  |     x = 43;
[INFO] [stdout]    |     ^^^^^^ `x` is assigned to here but it was already borrowed
[INFO] [stdout] ...
[INFO] [stdout] 12 |     assert_eq!(*y, 42);
[INFO] [stdout]    |     ------------------ borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0506`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `listing_1-2` (bin "listing_1-2") due to 2 previous errors; 1 warning emitted
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]  --> listing_1-2/src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     x = 43;
[INFO] [stdout]   |     ^
[INFO] [stdout]   |
[INFO] [stdout]   = help: maybe it is overwritten before being read?
[INFO] [stdout]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0506]: cannot assign to `x` because it is borrowed
[INFO] [stdout]   --> listing_1-2/src/main.rs:9:5
[INFO] [stdout]    |
[INFO] [stdout] 7  |     let y = &x;
[INFO] [stdout]    |             -- `x` is borrowed here
[INFO] [stdout] 8  |     // this establishes a second, mutable flow from x:
[INFO] [stdout] 9  |     x = 43;
[INFO] [stdout]    |     ^^^^^^ `x` is assigned to here but it was already borrowed
[INFO] [stdout] ...
[INFO] [stdout] 12 |     assert_eq!(*y, 42);
[INFO] [stdout]    |     ------------------ borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0506`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `listing_1-2` (bin "listing_1-2" test) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "963679e7d417a1f9ef97736accb802a223879b4d9efca6500868e035a4e80baa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "963679e7d417a1f9ef97736accb802a223879b4d9efca6500868e035a4e80baa", kill_on_drop: false }`
[INFO] [stdout] 963679e7d417a1f9ef97736accb802a223879b4d9efca6500868e035a4e80baa