[INFO] cloning repository https://github.com/musicandelectronics/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/musicandelectronics/rust_practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicandelectronics%2Frust_practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicandelectronics%2Frust_practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d0cfce0be8afb79515398397da506b3bcfa5601
[INFO] checking musicandelectronics/rust_practice against try#a75eafceea413a1b40c0e0769db85e08ec17160b for pr-133925
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicandelectronics%2Frust_practice" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/musicandelectronics/rust_practice on toolchain a75eafceea413a1b40c0e0769db85e08ec17160b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/musicandelectronics/rust_practice
[INFO] finished tweaking git repo https://github.com/musicandelectronics/rust_practice
[INFO] tweaked toml for git repo https://github.com/musicandelectronics/rust_practice written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/musicandelectronics/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" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "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 musicandelectronics/rust_practice against try#a75eafceea413a1b40c0e0769db85e08ec17160b for pr-133925
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmusicandelectronics%2Frust_practice" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/musicandelectronics/rust_practice on toolchain a75eafceea413a1b40c0e0769db85e08ec17160b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/musicandelectronics/rust_practice
[INFO] finished tweaking git repo https://github.com/musicandelectronics/rust_practice
[INFO] tweaked toml for git repo https://github.com/musicandelectronics/rust_practice written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/musicandelectronics/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" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9a4bd099d2ecb42338bf1bef978ce59b313aa63ce3c4115d080bb28d4ef66660
[INFO] running `Command { std: "docker" "start" "-a" "9a4bd099d2ecb42338bf1bef978ce59b313aa63ce3c4115d080bb28d4ef66660", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9a4bd099d2ecb42338bf1bef978ce59b313aa63ce3c4115d080bb28d4ef66660", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a4bd099d2ecb42338bf1bef978ce59b313aa63ce3c4115d080bb28d4ef66660", kill_on_drop: false }`
[INFO] [stdout] 9a4bd099d2ecb42338bf1bef978ce59b313aa63ce3c4115d080bb28d4ef66660
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 18e80386ab286234f4d128da10cc02a4658fea7c4ad5584194c030d9489bb61b
[INFO] running `Command { std: "docker" "start" "-a" "18e80386ab286234f4d128da10cc02a4658fea7c4ad5584194c030d9489bb61b", kill_on_drop: false }`
[INFO] [stderr]     Checking controls v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable `R` should have a snake case name
[INFO] [stdout]  --> src/complexprac.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 |   fn new (R: i32, I: i32) -> Complex
[INFO] [stdout]   |           ^ help: convert the identifier to snake case: `r`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `I` should have a snake case name
[INFO] [stdout]  --> src/complexprac.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 |   fn new (R: i32, I: i32) -> Complex
[INFO] [stdout]   |                   ^ help: convert the identifier to snake case (notice the capitalization): `i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `R` should have a snake case name
[INFO] [stdout]  --> src/complexprac.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 |   fn new (R: i32, I: i32) -> Complex
[INFO] [stdout]   |           ^ help: convert the identifier to snake case: `r`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `I` should have a snake case name
[INFO] [stdout]  --> src/complexprac.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 |   fn new (R: i32, I: i32) -> Complex
[INFO] [stdout]   |                   ^ help: convert the identifier to snake case (notice the capitalization): `i`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "18e80386ab286234f4d128da10cc02a4658fea7c4ad5584194c030d9489bb61b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18e80386ab286234f4d128da10cc02a4658fea7c4ad5584194c030d9489bb61b", kill_on_drop: false }`
[INFO] [stdout] 18e80386ab286234f4d128da10cc02a4658fea7c4ad5584194c030d9489bb61b