guard with "break"/"continue" no longer works in 1.2.3

This compiles and runs on 1.2.2 but not 1.2.3 master:

shared void run() {
    for (i in 0:1) {
        String? s = "";
        if (!exists s) {
            break; // or continue;
        }
        print(s.size);
    }
}

on master:

source/simple/run.ceylon:7: error: method or attribute does not exist: 'size' in type 'String?'
        print(s.size);
                ^
1 error

[gavinking]

I have figured out how to make this work correctly.

[gavinking]

Well the previous implementation was completely wrong, to begin with.