[INFO] cloning repository https://github.com/kajstof/RustCrashCourse
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kajstof/RustCrashCourse" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkajstof%2FRustCrashCourse", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkajstof%2FRustCrashCourse'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7775f74297feea7b3aa5604e788118eb5717f33f
[INFO] building kajstof/RustCrashCourse against master#ad85bc524b1ad696e42061ad8338d382dffbdbe5 for pr-146237-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkajstof%2FRustCrashCourse" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/kajstof/RustCrashCourse
[INFO] finished tweaking git repo https://github.com/kajstof/RustCrashCourse
[INFO] tweaked toml for git repo https://github.com/kajstof/RustCrashCourse written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/kajstof/RustCrashCourse on toolchain ad85bc524b1ad696e42061ad8338d382dffbdbe5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/kajstof/RustCrashCourse 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" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24106edfe3f83e81a27e37daf53f97190d27f46ea3e7410893c1e57419c77676
[INFO] running `Command { std: "docker" "start" "-a" "24106edfe3f83e81a27e37daf53f97190d27f46ea3e7410893c1e57419c77676", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24106edfe3f83e81a27e37daf53f97190d27f46ea3e7410893c1e57419c77676", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24106edfe3f83e81a27e37daf53f97190d27f46ea3e7410893c1e57419c77676", kill_on_drop: false }`
[INFO] [stdout] 24106edfe3f83e81a27e37daf53f97190d27f46ea3e7410893c1e57419c77676
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+ad85bc524b1ad696e42061ad8338d382dffbdbe5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ce834990148c7ee14978d067d80be08f5d1d4cd46abdd49877e41b24fb74308b
[INFO] running `Command { std: "docker" "start" "-a" "ce834990148c7ee14978d067d80be08f5d1d4cd46abdd49877e41b24fb74308b", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_crash_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/pointer_ref.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut vec2 = &vec1;
[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] error[E0596]: cannot borrow `*vec2` as mutable, as it is behind a `&` reference
[INFO] [stdout]   --> src/pointer_ref.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     vec2.push(5);
[INFO] [stdout]    |     ^^^^ `vec2` is a `&` reference, so the data it refers to cannot be borrowed as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be a mutable reference
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut vec2 = &mut vec1;
[INFO] [stdout]    |                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_crash_course` (bin "rust_crash_course") due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "ce834990148c7ee14978d067d80be08f5d1d4cd46abdd49877e41b24fb74308b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce834990148c7ee14978d067d80be08f5d1d4cd46abdd49877e41b24fb74308b", kill_on_drop: false }`
[INFO] [stdout] ce834990148c7ee14978d067d80be08f5d1d4cd46abdd49877e41b24fb74308b