SisuE0143
Loop label used by an enclosing loop
ErrorA loop may not take the loop label of a loop around it. Two loops side by side may share a loop label.
Why
A break or continue that names a loop label reaches the innermost loop around it with that loop label. When an inner loop takes an outer loop's loop label, no jump inside the inner loop can name the outer one, and a reader cannot tell which loop a jump was meant for. Rename one of the loop labels, or delete the one no jump needs.
Broken
fn main() {
outer: for x in [1, 2] {
outer: for y in [3, 4] {
if x + y == 5 {
break outer
}
print(y)
}
}
}
What sisu says
error[E0143]: loop label `outer` is already used by an enclosing loop --> E0143.sisu:3:9 | 2 | outer: for x in [1, 2] { | ----- the enclosing loop's label 3 | outer: for y in [3, 4] { | ^^^^^ | = help: rename one of the loop labels sisu: 1 error sisu: for more on a code, run `sisu explain <code>`: E0143
Fixed
fn main() {
outer: for x in [1, 2] {
for y in [3, 4] {
if x + y == 5 {
break outer
}
print(y)
}
}
}