Variables are not scoped within loops

[nex3]

A variable declared within a loop is not correctly scoped within that loop. Consider the following code:

main() {
  for (var i = 0; i < 5; i++) {
    var a;
    if (a == null) a = 0;
    a += 1;
    print(a);
  }
}

This should print 1 five times, since a should be local to each loop iteration. Instead, it prints 1 through 5. If a is explicitly initialized to null, it behaves correctly.

[jmesserly]

Yeah, this is an issue with us not initializing things to null properly. Fix incoming.

[jmesserly]

Added Fixed label.