[INFO] cloning repository https://github.com/tootoobeepbeep/raytrace
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tootoobeepbeep/raytrace" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftootoobeepbeep%2Fraytrace", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftootoobeepbeep%2Fraytrace'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8e8cd4a124a4c9e7ece090ce582c450cce0dacad
[INFO] checking tootoobeepbeep/raytrace against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftootoobeepbeep%2Fraytrace" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tootoobeepbeep/raytrace on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tootoobeepbeep/raytrace
[INFO] finished tweaking git repo https://github.com/tootoobeepbeep/raytrace
[INFO] tweaked toml for git repo https://github.com/tootoobeepbeep/raytrace written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tootoobeepbeep/raytrace 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 552b6335cde729d3f83cdb3d35490e4b87b4bdd4029b9ec1795280a389f3a06b
[INFO] running `Command { std: "docker" "start" "-a" "552b6335cde729d3f83cdb3d35490e4b87b4bdd4029b9ec1795280a389f3a06b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "552b6335cde729d3f83cdb3d35490e4b87b4bdd4029b9ec1795280a389f3a06b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "552b6335cde729d3f83cdb3d35490e4b87b4bdd4029b9ec1795280a389f3a06b", kill_on_drop: false }`
[INFO] [stdout] 552b6335cde729d3f83cdb3d35490e4b87b4bdd4029b9ec1795280a389f3a06b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 939195d656e720b8085223663ad8f8401e63363b0bca6352e2051575fbd76489
[INFO] running `Command { std: "docker" "start" "-a" "939195d656e720b8085223663ad8f8401e63363b0bca6352e2051575fbd76489", kill_on_drop: false }`
[INFO] [stderr]     Checking raytracer v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0596]: cannot borrow `buffer` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let buffer = BufWriter::new(f);
[INFO] [stdout]    |         ^^^^^^ not mutable
[INFO] [stdout] ...
[INFO] [stdout] 38 |     buffer.write(s.as_bytes());
[INFO] [stdout]    |     ------ cannot borrow as mutable
[INFO] [stdout] ...
[INFO] [stdout] 49 |             buffer.write(s.as_bytes()); // need a buffered writer.
[INFO] [stdout]    |             ------ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let mut buffer = BufWriter::new(f);
[INFO] [stdout]    |         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `buffer` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/main.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let buffer = BufWriter::new(f);
[INFO] [stdout]    |         ^^^^^^ not mutable
[INFO] [stdout] ...
[INFO] [stdout] 38 |     buffer.write(s.as_bytes());
[INFO] [stdout]    |     ------ cannot borrow as mutable
[INFO] [stdout] ...
[INFO] [stdout] 49 |             buffer.write(s.as_bytes()); // need a buffered writer.
[INFO] [stdout]    |             ------ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let mut buffer = BufWriter::new(f);
[INFO] [stdout]    |         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `raytracer` (bin "raytracer") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `raytracer` (bin "raytracer" test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "939195d656e720b8085223663ad8f8401e63363b0bca6352e2051575fbd76489", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "939195d656e720b8085223663ad8f8401e63363b0bca6352e2051575fbd76489", kill_on_drop: false }`
[INFO] [stdout] 939195d656e720b8085223663ad8f8401e63363b0bca6352e2051575fbd76489