[INFO] cloning repository https://github.com/KGKalani/rust_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KGKalani/rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKGKalani%2Frust_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKGKalani%2Frust_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d236a32b79162e8f306b4f7fd4d94c9f87c496ea
[INFO] checking KGKalani/rust_learning against try#b66808126f24f2f30898306a881e1676824ea80c for pr-133502-23
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKGKalani%2Frust_learning" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/KGKalani/rust_learning
[INFO] finished tweaking git repo https://github.com/KGKalani/rust_learning
[INFO] tweaked toml for git repo https://github.com/KGKalani/rust_learning written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KGKalani/rust_learning on toolchain b66808126f24f2f30898306a881e1676824ea80c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b66808126f24f2f30898306a881e1676824ea80c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KGKalani/rust_learning 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" "+b66808126f24f2f30898306a881e1676824ea80c" "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 KGKalani/rust_learning against try#b66808126f24f2f30898306a881e1676824ea80c for pr-133502-23
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKGKalani%2Frust_learning" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/KGKalani/rust_learning
[INFO] finished tweaking git repo https://github.com/KGKalani/rust_learning
[INFO] tweaked toml for git repo https://github.com/KGKalani/rust_learning written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KGKalani/rust_learning on toolchain b66808126f24f2f30898306a881e1676824ea80c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b66808126f24f2f30898306a881e1676824ea80c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KGKalani/rust_learning 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" "+b66808126f24f2f30898306a881e1676824ea80c" "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-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3d5ced03c013a94a2f102a4510f48a6e9184255caf5fd8244f58017bde7f5210" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3
[INFO] running `Command { std: "docker" "start" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3" "/opt/rustwide/cargo-home/bin/cargo" "+b66808126f24f2f30898306a881e1676824ea80c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3" "/opt/rustwide/cargo-home/bin/cargo" "+b66808126f24f2f30898306a881e1676824ea80c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking getrandom v0.2.15
[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 rust_learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ownership_module/fixing_ownershi_errors.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 130 |     let mut name = vec![String::from("Ferris")];
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ownership_module/fixing_ownershi_errors.rs:136:9
[INFO] [stdout]     |
[INFO] [stdout] 136 |     let mut name = vec![String::from("Ferris")];
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/common_concepts_module/function_concepts.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     x + y + z;  // This is a statement because there is a semmicolon at the end of x + y, this is not return
[INFO] [stdout]    |     ^^^^^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let _ = x + y + z;  // This is a statement because there is a semmicolon at the end of x + y, this is not return
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.60s
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ownership_module/fixing_ownershi_errors.rs:130:9
[INFO] [stdout]     |
[INFO] [stdout] 130 |     let mut name = vec![String::from("Ferris")];
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/ownership_module/fixing_ownershi_errors.rs:136:9
[INFO] [stdout]     |
[INFO] [stdout] 136 |     let mut name = vec![String::from("Ferris")];
[INFO] [stdout]     |         ----^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/common_concepts_module/function_concepts.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     x + y + z;  // This is a statement because there is a semmicolon at the end of x + y, this is not return
[INFO] [stdout]    |     ^^^^^^^^^ the arithmetic operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let _ = x + y + z;  // This is a statement because there is a semmicolon at the end of x + y, this is not return
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3", kill_on_drop: false }`
[INFO] [stdout] ccc3410dd0f0a5d511da03918e92f0cc7fa8cc415e52927e2a87a281a48b82e3
