Doesn't modify these:
* [Operators](http://doc.rust-lang.org/rust.html#operators): An alternative sorting is unclear.
* [Marker types](http://doc.rust-lang.org/rust.html#marker-types): Could be sorted but uncertain how. See below.
* [Stability](http://doc.rust-lang.org/rust.html#stability): Already sorted by stability
---
[Marker types](http://doc.rust-lang.org/rust.html#marker-types) has an extra newline above `fail_` which may throw off formatting (see #16412) or it may be for some other reason. If the newline is just a typo, I can just remove it and format this alphabetically like so:
```rust
// Sorted alphabetically
a_bread
b_bread
c_bread
fail_
fail_bounds_check
a_type
b_type
c_type
```
Marker types is listed as likely to become out of date so I don't know if this is worth doing anyway.
[EDIT] modified `Marker types` now and tried to update the language items list.