[INFO] cloning repository https://github.com/junhuang-ho/rust-syntax-basics-refresher
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/junhuang-ho/rust-syntax-basics-refresher" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjunhuang-ho%2Frust-syntax-basics-refresher", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjunhuang-ho%2Frust-syntax-basics-refresher'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 10de361479ba4a95021ca34c0f8dbc50163862f0
[INFO] checking junhuang-ho/rust-syntax-basics-refresher against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjunhuang-ho%2Frust-syntax-basics-refresher" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher 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 git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher
[INFO] finished tweaking git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher
[INFO] tweaked toml for git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher 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]     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
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking junhuang-ho/rust-syntax-basics-refresher against try#bfe97fcae016881ad333f0ff8cea2cadb9cf136c for pr-121848
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjunhuang-ho%2Frust-syntax-basics-refresher" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher on toolchain bfe97fcae016881ad333f0ff8cea2cadb9cf136c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher
[INFO] finished tweaking git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher
[INFO] tweaked toml for git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/junhuang-ho/rust-syntax-basics-refresher 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" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b8c987da2b678251d7fd7fc43edd0f5ce8d9b4b83a821c70be3b0590b65a9cf7
[INFO] running `Command { std: "docker" "start" "-a" "b8c987da2b678251d7fd7fc43edd0f5ce8d9b4b83a821c70be3b0590b65a9cf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8c987da2b678251d7fd7fc43edd0f5ce8d9b4b83a821c70be3b0590b65a9cf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8c987da2b678251d7fd7fc43edd0f5ce8d9b4b83a821c70be3b0590b65a9cf7", kill_on_drop: false }`
[INFO] [stdout] b8c987da2b678251d7fd7fc43edd0f5ce8d9b4b83a821c70be3b0590b65a9cf7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+bfe97fcae016881ad333f0ff8cea2cadb9cf136c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 064f758977843f7d3b6d39682de5e5835c800360a62b957f9ded1163be483507
[INFO] running `Command { std: "docker" "start" "-a" "064f758977843f7d3b6d39682de5e5835c800360a62b957f9ded1163be483507", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.146
[INFO] [stderr]     Checking getrandom v0.2.10
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking test1 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]  --> src/test.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{self, Rng};
[INFO] [stdout]   |            ^^^^ the item `rand` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `rand` is imported redundantly
[INFO] [stdout]  --> src/test.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::{self, Rng};
[INFO] [stdout]   |            ^^^^ the item `rand` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rec`
[INFO] [stdout]    --> src/structs.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |     let rec = Rectangle {
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_rec`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `length` and `height` are never read
[INFO] [stdout]   --> src/structs.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Rectangle<T, U> {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 45 |     length: T,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 46 |     height: U,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `width` is never read
[INFO] [stdout]   --> src/structs.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct Circle {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 60 |     length: f32,
[INFO] [stdout] 61 |     width: f32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rec`
[INFO] [stdout]    --> src/structs.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |     let rec = Rectangle {
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_rec`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `length` and `height` are never read
[INFO] [stdout]   --> src/structs.rs:45:5
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Rectangle<T, U> {
[INFO] [stdout]    |        --------- fields in this struct
[INFO] [stdout] 45 |     length: T,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 46 |     height: U,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `width` is never read
[INFO] [stdout]   --> src/structs.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct Circle {
[INFO] [stdout]    |        ------ field in this struct
[INFO] [stdout] 60 |     length: f32,
[INFO] [stdout] 61 |     width: f32,
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.47s
[INFO] running `Command { std: "docker" "inspect" "064f758977843f7d3b6d39682de5e5835c800360a62b957f9ded1163be483507", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "064f758977843f7d3b6d39682de5e5835c800360a62b957f9ded1163be483507", kill_on_drop: false }`
[INFO] [stdout] 064f758977843f7d3b6d39682de5e5835c800360a62b957f9ded1163be483507