rust/src/librustc_error_codes/error_codes/E0695.md

A break statement without a label appeared inside a labeled block.

Example of erroneous code:

# #![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;
}