Variant name not capitalized

Built from the repository at commit a8614dc.

A variant name starts with an upper-case letter: North, not north. The unsafe fix capitalizes it. A name that does not start with a lower-case letter, such as _north, gets no fix: capitalizing _north would change nothing.

Why

A pattern tells a variant from a new binding by its first letter: North => ... tests for the variant, and north => ... binds whatever value is there. The fix is unsafe because the capitalized name may already be taken.

Broken

enum Direction {
    north
    South
}

fn main() {
    print(1)
}

What sisu says

error[E0113]: a variant name starts with an upper-case letter: `North`
 --> E0113.sisu:2:5
  |
2 |     north
  |     ^^^^^
  |
help: capitalize it
  |
2 -     north
2 +     North
  |

sisu: 1 error
sisu: for more on a code, run `sisu explain <code>`: E0113

Fixed

enum Direction {
    North
    South
}

fn main() {
    let d = Direction.North
    print(d == Direction.South)
}