[INFO] cloning repository https://github.com/IminatoPo/Beginner
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/IminatoPo/Beginner" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIminatoPo%2FBeginner", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIminatoPo%2FBeginner'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39d7806d952dc00f0fe7ca3fae94e3e5e914dce9
[INFO] checking IminatoPo/Beginner against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FIminatoPo%2FBeginner" "/workspace/builds/worker-21/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-21/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/IminatoPo/Beginner on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/IminatoPo/Beginner
[INFO] finished tweaking git repo https://github.com/IminatoPo/Beginner
[INFO] tweaked toml for git repo https://github.com/IminatoPo/Beginner written to /workspace/builds/worker-21/source/Cargo.toml
[INFO] crate git repo https://github.com/IminatoPo/Beginner already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a71e3e156365fb46c7197ab59d299f46dab756b10962086a542852f7d1039c2
[INFO] running `Command { std: "docker" "start" "-a" "5a71e3e156365fb46c7197ab59d299f46dab756b10962086a542852f7d1039c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a71e3e156365fb46c7197ab59d299f46dab756b10962086a542852f7d1039c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a71e3e156365fb46c7197ab59d299f46dab756b10962086a542852f7d1039c2", kill_on_drop: false }`
[INFO] [stdout] 5a71e3e156365fb46c7197ab59d299f46dab756b10962086a542852f7d1039c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-21/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f8d38246d22b89233c9d05c289459abf2d3fc2a5d256ad0b5f193ed137d7f78a
[INFO] running `Command { std: "docker" "start" "-a" "f8d38246d22b89233c9d05c289459abf2d3fc2a5d256ad0b5f193ed137d7f78a", kill_on_drop: false }`
[INFO] [stderr]     Checking Hello_Rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut rust = "Rust";
[INFO] [stdout]   |         ----^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `Hello_Rust` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `hello_rust`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut rust = "Rust";
[INFO] [stdout]   |         ----^^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: crate `Hello_Rust` should have a snake case name
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout]   = help: convert the identifier to snake case: `hello_rust`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `Command { std: "docker" "inspect" "f8d38246d22b89233c9d05c289459abf2d3fc2a5d256ad0b5f193ed137d7f78a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8d38246d22b89233c9d05c289459abf2d3fc2a5d256ad0b5f193ed137d7f78a", kill_on_drop: false }`
[INFO] [stdout] f8d38246d22b89233c9d05c289459abf2d3fc2a5d256ad0b5f193ed137d7f78a