[INFO] cloning repository https://github.com/arupadhy/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arupadhy/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e03e1afea792a0b3192c0a7c77e36ed3d89f9a7c
[INFO] testing arupadhy/rust-playground against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farupadhy%2Frust-playground" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arupadhy/rust-playground on toolchain 62efba8a050c64249dab942951bb28f710208bc8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/arupadhy/rust-playground
[INFO] finished tweaking git repo https://github.com/arupadhy/rust-playground
[INFO] tweaked toml for git repo https://github.com/arupadhy/rust-playground written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/arupadhy/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ced20dd48492717e035f2fc7296a5ca7fec01ac8a2684038b3facbf36523f28
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7ced20dd48492717e035f2fc7296a5ca7fec01ac8a2684038b3facbf36523f28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ced20dd48492717e035f2fc7296a5ca7fec01ac8a2684038b3facbf36523f28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ced20dd48492717e035f2fc7296a5ca7fec01ac8a2684038b3facbf36523f28", kill_on_drop: false }`
[INFO] [stdout] 7ced20dd48492717e035f2fc7296a5ca7fec01ac8a2684038b3facbf36523f28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f4036db6944ab39b498ecc41e4c73bff3520c907d93653ada415acfb968e16e9
[INFO] running `Command { std: "docker" "start" "-a" "f4036db6944ab39b498ecc41e4c73bff3520c907d93653ada415acfb968e16e9", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: invalid format string: expected `'}'`, found `'?'`
[INFO] [stdout]   --> src/slice.rs:36:55
[INFO] [stdout]    |
[INFO] [stdout] 36 |   println!("this is an array borrowed by this method {?}", param);
[INFO] [stdout]    |                                                      -^ expected `}` in format string
[INFO] [stdout]    |                                                      |
[INFO] [stdout]    |                                                      because of this opening brace
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you intended to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `'}'`, found `'?'`
[INFO] [stdout]   --> src/slice.rs:40:73
[INFO] [stdout]    |
[INFO] [stdout] 40 |   println!("this is an vector having u8 values borrowed by this method {?}", param);
[INFO] [stdout]    |                                                                        -^ expected `}` in format string
[INFO] [stdout]    |                                                                        |
[INFO] [stdout]    |                                                                        because of this opening brace
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you intended to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: invalid format string: expected `'}'`, found `'?'`
[INFO] [stdout]   --> src/slice.rs:44:46
[INFO] [stdout]    |
[INFO] [stdout] 44 |   println!("this can be called by any slice {?}", param);
[INFO] [stdout]    |                                             -^ expected `}` in format string
[INFO] [stdout]    |                                             |
[INFO] [stdout]    |                                             because of this opening brace
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you intended to print `{`, you can escape it using `{{`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-playground` due to 4 previous errors
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f4036db6944ab39b498ecc41e4c73bff3520c907d93653ada415acfb968e16e9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4036db6944ab39b498ecc41e4c73bff3520c907d93653ada415acfb968e16e9", kill_on_drop: false }`
[INFO] [stdout] f4036db6944ab39b498ecc41e4c73bff3520c907d93653ada415acfb968e16e9