[INFO] cloning repository https://github.com/shubhraagarwal/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shubhraagarwal/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshubhraagarwal%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshubhraagarwal%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 67409a44785be90901dcaf823287d4cfdaebcdbc
[INFO] building shubhraagarwal/rust-practice against try#9b5e8b16bd1c4acf4cf8e6880368314cf021a987+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshubhraagarwal%2Frust-practice" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shubhraagarwal/rust-practice on toolchain 9b5e8b16bd1c4acf4cf8e6880368314cf021a987
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shubhraagarwal/rust-practice
[INFO] finished tweaking git repo https://github.com/shubhraagarwal/rust-practice
[INFO] tweaked toml for git repo https://github.com/shubhraagarwal/rust-practice written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/shubhraagarwal/rust-practice 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" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "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] building shubhraagarwal/rust-practice against try#9b5e8b16bd1c4acf4cf8e6880368314cf021a987+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshubhraagarwal%2Frust-practice" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shubhraagarwal/rust-practice on toolchain 9b5e8b16bd1c4acf4cf8e6880368314cf021a987
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/shubhraagarwal/rust-practice
[INFO] finished tweaking git repo https://github.com/shubhraagarwal/rust-practice
[INFO] tweaked toml for git repo https://github.com/shubhraagarwal/rust-practice written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/shubhraagarwal/rust-practice 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" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 84ad7a47c0e23ea60ec4a095ab231efb253b35fd139715c14f51455e985b4547
[INFO] running `Command { std: "docker" "start" "-a" "84ad7a47c0e23ea60ec4a095ab231efb253b35fd139715c14f51455e985b4547", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "84ad7a47c0e23ea60ec4a095ab231efb253b35fd139715c14f51455e985b4547", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84ad7a47c0e23ea60ec4a095ab231efb253b35fd139715c14f51455e985b4547", kill_on_drop: false }`
[INFO] [stdout] 84ad7a47c0e23ea60ec4a095ab231efb253b35fd139715c14f51455e985b4547
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9b5e8b16bd1c4acf4cf8e6880368314cf021a987" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 50aeb6706a60aef261460c78e85f1b2c3a1c07e146d9c5d747c781f96bfb004f
[INFO] running `Command { std: "docker" "start" "-a" "50aeb6706a60aef261460c78e85f1b2c3a1c07e146d9c5d747c781f96bfb004f", kill_on_drop: false }`
[INFO] [stderr]    Compiling hello-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0753]: expected outer doc comment
[INFO] [stdout]  --> src/variables.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     //! variables2.rs
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: inner doc comments like this (starting with `//!` or `/*!`) can only appear before items
[INFO] [stdout] help: you might have meant to write a regular comment
[INFO] [stdout]   |
[INFO] [stdout] 7 -     //! variables2.rs
[INFO] [stdout] 7 +     // variables2.rs
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0753]: expected outer doc comment
[INFO] [stdout]   --> src/variables.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     //! variables3.rs
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: inner doc comments like this (starting with `//!` or `/*!`) can only appear before items
[INFO] [stdout] help: you might have meant to write a regular comment
[INFO] [stdout]    |
[INFO] [stdout] 14 -     //! variables3.rs
[INFO] [stdout] 14 +     // variables3.rs
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0753]: expected outer doc comment
[INFO] [stdout]   --> src/variables.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     //! variables5.rs
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: inner doc comments like this (starting with `//!` or `/*!`) can only appear before items
[INFO] [stdout] help: you might have meant to write a regular comment
[INFO] [stdout]    |
[INFO] [stdout] 22 -     //! variables5.rs
[INFO] [stdout] 22 +     // variables5.rs
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0753]: expected outer doc comment
[INFO] [stdout]   --> src/variables.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     //! variables6.rs
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 29 |     println!("Number {}", NUMBER);
[INFO] [stdout]    |     ------------------------------ the inner doc comment doesn't annotate this item macro invocation
[INFO] [stdout]    |
[INFO] [stdout] help: to annotate the item macro invocation, change the doc comment from inner to outer style
[INFO] [stdout]    |
[INFO] [stdout] 28 |     /// variables6.rs
[INFO] [stdout]    |       ~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/variables.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 28 |     //! variables6.rs
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
[INFO] [stdout]    |
[INFO] [stdout]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stdout]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]  --> src/variables.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     //! variables2.rs
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 8 |     let x : u8 = 10;
[INFO] [stdout]   |     ---------------- rustdoc does not generate documentation for statements
[INFO] [stdout]   |
[INFO] [stdout]   = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/variables.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     //! variables3.rs
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 15 |     let mut x = 3;
[INFO] [stdout]    |     -------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused doc comment
[INFO] [stdout]   --> src/variables.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     //! variables5.rs
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 23 |     let number = "T-H-R-E-E"; // don't change this line
[INFO] [stdout]    |     ------------------------- rustdoc does not generate documentation for statements
[INFO] [stdout]    |
[INFO] [stdout]    = help: use `//` for a plain comment
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0753`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hello-rust` (bin "hello-rust") due to 4 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "50aeb6706a60aef261460c78e85f1b2c3a1c07e146d9c5d747c781f96bfb004f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50aeb6706a60aef261460c78e85f1b2c3a1c07e146d9c5d747c781f96bfb004f", kill_on_drop: false }`
[INFO] [stdout] 50aeb6706a60aef261460c78e85f1b2c3a1c07e146d9c5d747c781f96bfb004f