[INFO] cloning repository https://github.com/gurry/efi_app
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gurry/efi_app" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgurry%2Fefi_app", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgurry%2Fefi_app'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 38a703789d62e5a267ad56beb7e9fb88aeeb5f62
[INFO] testing gurry/efi_app against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgurry%2Fefi_app" "/workspace/builds/worker-3/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gurry/efi_app on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/gurry/efi_app
[INFO] finished tweaking git repo https://github.com/gurry/efi_app
[INFO] tweaked toml for git repo https://github.com/gurry/efi_app written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/gurry/efi_app already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 708a32be41eb63b817b6215049a1eba5d2c6bb6cd7e2670d72d83c492bc3ec60
[INFO] running `Command { std: "docker" "start" "-a" "708a32be41eb63b817b6215049a1eba5d2c6bb6cd7e2670d72d83c492bc3ec60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "708a32be41eb63b817b6215049a1eba5d2c6bb6cd7e2670d72d83c492bc3ec60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "708a32be41eb63b817b6215049a1eba5d2c6bb6cd7e2670d72d83c492bc3ec60", kill_on_drop: false }`
[INFO] [stdout] 708a32be41eb63b817b6215049a1eba5d2c6bb6cd7e2670d72d83c492bc3ec60
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9dee7380c921642c2e9c23081b800534887e2ba93d64379e937920f654be4a35
[INFO] running `Command { std: "docker" "start" "-a" "9dee7380c921642c2e9c23081b800534887e2ba93d64379e937920f654be4a35", kill_on_drop: false }`
[INFO] [stderr]    Compiling byteorder v1.2.3
[INFO] [stderr]    Compiling synstructure v0.6.1
[INFO] [stderr]    Compiling failure_derive v0.1.1
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling efi v0.1.3 (https://github.com/gurry/efi#bd2e6ff3)
[INFO] [stdout] error[E0425]: cannot find function `utf8_char_width` in module `core_str`
[INFO] [stdout]     --> /opt/rustwide/cargo-home/git/checkouts/efi-2217c5ec7f518188/bd2e6ff/src/io/mod.rs:1960:31
[INFO] [stdout]      |
[INFO] [stdout] 1960 |         let width = core_str::utf8_char_width(first_byte);
[INFO] [stdout]      |                               ^^^^^^^^^^^^^^^ not found in `core_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/efi-2217c5ec7f518188/bd2e6ff/src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(str_internals)] // TODO: this looks very new and unstable. Can we get rid of it?
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/efi-2217c5ec7f518188/bd2e6ff/src/lib.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #![feature(ptr_internals)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0425, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0425`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `efi` due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "9dee7380c921642c2e9c23081b800534887e2ba93d64379e937920f654be4a35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9dee7380c921642c2e9c23081b800534887e2ba93d64379e937920f654be4a35", kill_on_drop: false }`
[INFO] [stdout] 9dee7380c921642c2e9c23081b800534887e2ba93d64379e937920f654be4a35