E0115

Enum without variants

Error

Built from the repository at commit a8614dc.

An enum needs at least one variant.

Why

A value of an enum is one of its variants, so an enum with none has no values at all, and nothing could use it. The variants are yours to name, so there is no fix.

Broken

enum Empty {}

fn main() {
    print(1)
}

What sisu says

error[E0115]: `Empty` needs at least one variant
 --> E0115.sisu:1:6
  |
1 | enum Empty {}
  |      ^^^^^

sisu: 1 error
sisu: for more on a code, run `sisu explain <code>`: E0115

Fixed

enum Signal {
    Go
}

fn main() {
    let s = Signal.Go
    print(s == Signal.Go)
}