Loop label that is never used

Built from the repository at commit a8614dc.

A loop label that no break or continue names is a warning, and the program still builds. The fix deletes the loop label, and its line break when it stands on a line of its own. A loop label that only a failed jump names is not reported: that jump's error is.

Why

A loop label tells a reader that a jump inside the loop names it. One that no jump names is left over from an edit, or belongs to a break or continue that lost its loop label. Deleting it changes nothing the program does.

Broken

fn main() {
    outer: for x in [1, 2] {
        print(x)
    }
}

What sisu says

warning[W0008]: loop label `outer` is never used
 --> W0008.sisu:2:5
  |
2 |     outer: for x in [1, 2] {
  |     ^^^^^
  |
  = help: delete the loop label, or name it in a `break` or `continue`
help: delete the loop label
  |
2 -     outer: for x in [1, 2] {
2 +     for x in [1, 2] {
  |

sisu: 1 warning
sisu: for more on a code, run `sisu explain <code>`: W0008

Fixed

fn main() {
    for x in [1, 2] {
        print(x)
    }
}

Related

• E0143: a loop label used by an enclosing loop.
• E0144: break or continue naming no loop label around it.