panic-halt 0.2.0

# rustc version
rustc 1.28.0-dev (b9bf4f162 2018-06-02)# docs.rs version
cratesfyi 0.5.0 (579f83b 2018-03-05)# build log
Updating registry `https://github.com/rust-lang/crates.io-index`
Downloading panic-halt v0.2.0
Documenting panic-halt v0.2.0
Running `rustdoc --crate-name panic_halt .cargo/registry/src/github.com-1ecc6299db9ec823/panic-halt-0.2.0/src/lib.rs -o /home/cratesfyi/cratesfyi/doc -Z unstable-options --resource-suffix -20180602-1.28.0-dev-b9bf4f162 -L dependency=/home/cratesfyi/cratesfyi/debug/deps`
error[E0658]: The attribute `panic_handler` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
--> .cargo/registry/src/github.com-1ecc6299db9ec823/panic-halt-0.2.0/src/lib.rs:30:1
|
30 | #[panic_handler]
| ^^^^^^^^^^^^^^^^
|
= help: add #![feature(custom_attribute)] to the crate attributes to enable

thread 'main' panicked at 'Error(
CargoError(
ChainedError {
error: Could not document `panic-halt`.,
cause: process didn't exit successfully: `rustdoc --crate-name panic_halt .cargo/registry/src/github.com-1ecc6299db9ec823/panic-halt-0.2.0/src/lib.rs -o /home/cratesfyi/cratesfyi/doc -Z unstable-options --resource-suffix -20180602-1.28.0-dev-b9bf4f162 -L dependency=/home/cratesfyi/cratesfyi/debug/deps` (exit code: 101)
}
),
State {
next_error: None,
backtrace: None
}
)', src/bin/cratesfyi.rs:142:13
note: Run with `RUST_BACKTRACE=1` for a backtrace.