A break statement without a label appeared inside a labeled block.
Erroneous code example:
# #![feature(label_break_value)]
loop {
'a: {
break;
}
}
Make sure to always label the break:
# #![feature(label_break_value)]
'l: loop {
'a: {
break 'l;
}
}
Or if you want to break the labeled block:
# #![feature(label_break_value)]
loop {
'a: {
break 'a;
}
break;
}