[INFO] updating cached repository JosephFerano/rust_os
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/JosephFerano/rust_os
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/JosephFerano/rust_os" "work/ex/beta-1.38-1/sources/1.37.0/gh/JosephFerano/rust_os"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/JosephFerano/rust_os'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/JosephFerano/rust_os" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/JosephFerano/rust_os"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/JosephFerano/rust_os'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0502adec20e78e6019d68a023520c0c30f3fcff8
[INFO] sha for GitHub repo JosephFerano/rust_os: 0502adec20e78e6019d68a023520c0c30f3fcff8
[INFO] validating manifest of JosephFerano/rust_os on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of JosephFerano/rust_os on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing JosephFerano/rust_os
[INFO] finished frobbing JosephFerano/rust_os
[INFO] frobbed toml for JosephFerano/rust_os written to work/ex/beta-1.38-1/sources/1.37.0/gh/JosephFerano/rust_os/Cargo.toml
[INFO] started frobbing JosephFerano/rust_os
[INFO] finished frobbing JosephFerano/rust_os
[INFO] frobbed toml for JosephFerano/rust_os written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/JosephFerano/rust_os/Cargo.toml
[INFO] crate JosephFerano/rust_os already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing JosephFerano/rust_os against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/JosephFerano/rust_os:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 50b64c4c15216a8bd353af76f6bc8c9906099dc4b4c5938ea24557aa5c28dc1f
[INFO] running `"docker" "start" "-a" "50b64c4c15216a8bd353af76f6bc8c9906099dc4b4c5938ea24557aa5c28dc1f"`
[INFO] [stderr]    Compiling bitflags v1.0.4
[INFO] [stderr]    Compiling volatile v0.2.4
[INFO] [stderr]    Compiling multiboot2 v0.7.1
[INFO] [stderr]    Compiling first_os v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(lang_items)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/vga_buffer.rs:89:21
[INFO] [stderr]    |
[INFO] [stderr] 89 |                 0x20...0x7e | b'\n' => self.write_byte(byte),
[INFO] [stderr]    |                     ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(ellipsis_inclusive_range_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `first_os`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "50b64c4c15216a8bd353af76f6bc8c9906099dc4b4c5938ea24557aa5c28dc1f"`
[INFO] running `"docker" "rm" "-f" "50b64c4c15216a8bd353af76f6bc8c9906099dc4b4c5938ea24557aa5c28dc1f"`
[INFO] [stdout] 50b64c4c15216a8bd353af76f6bc8c9906099dc4b4c5938ea24557aa5c28dc1f