[INFO] cloning repository https://github.com/jacoobes/hello_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jacoobes/hello_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacoobes%2Fhello_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacoobes%2Fhello_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] aece6325a1b56f45a774f697a8fe9f30545d97ab
[INFO] testing jacoobes/hello_rust against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjacoobes%2Fhello_rust" "/workspace/builds/worker-73/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-73/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jacoobes/hello_rust on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jacoobes/hello_rust
[INFO] finished tweaking git repo https://github.com/jacoobes/hello_rust
[INFO] tweaked toml for git repo https://github.com/jacoobes/hello_rust written to /workspace/builds/worker-73/source/Cargo.toml
[INFO] crate git repo https://github.com/jacoobes/hello_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "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-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9cd179f4feb21a2b0a2df702d3fa8e4f1b6955a73e0f5439a9279d8bc177daf5
[INFO] running `Command { std: "docker" "start" "-a" "9cd179f4feb21a2b0a2df702d3fa8e4f1b6955a73e0f5439a9279d8bc177daf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9cd179f4feb21a2b0a2df702d3fa8e4f1b6955a73e0f5439a9279d8bc177daf5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cd179f4feb21a2b0a2df702d3fa8e4f1b6955a73e0f5439a9279d8bc177daf5", kill_on_drop: false }`
[INFO] [stdout] 9cd179f4feb21a2b0a2df702d3fa8e4f1b6955a73e0f5439a9279d8bc177daf5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c9a03b51e7bfcaf57860cab89f723315212e269c4da3c881ece2987183023c3d
[INFO] running `Command { std: "docker" "start" "-a" "c9a03b51e7bfcaf57860cab89f723315212e269c4da3c881ece2987183023c3d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling hello_world_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0499]: cannot borrow `str` as mutable more than once at a time
[INFO] [stdout]   --> src/ownership_borrowing.rs:8:16
[INFO] [stdout]    |
[INFO] [stdout] 7  |     let str2 = &mut str;
[INFO] [stdout]    |                -------- first mutable borrow occurs here
[INFO] [stdout] 8  |     let str3 = &mut str;
[INFO] [stdout]    |                ^^^^^^^^ second mutable borrow occurs here
[INFO] [stdout] 9  | 
[INFO] [stdout] 10 |     println!("{}, {}", str2,str3);
[INFO] [stdout]    |                        ---- first borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0499`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hello_world_rust` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c9a03b51e7bfcaf57860cab89f723315212e269c4da3c881ece2987183023c3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c9a03b51e7bfcaf57860cab89f723315212e269c4da3c881ece2987183023c3d", kill_on_drop: false }`
[INFO] [stdout] c9a03b51e7bfcaf57860cab89f723315212e269c4da3c881ece2987183023c3d