Is this a known pig8->pig9 regression? Scoping within a foreach block

[Jonathan Coveney]

relation = load 'relation' as (val1:int,val2:int,val3:int);

b = load 'temp';

relation2 = FOREACH (GROUP relation BY val1) {
  a = COUNT(relation.val2);
  b = SUM(relation.val3);
  GENERATE group, (long)a, (long)b;
}

in pig 8 this works, in pig 9 it doesn't.

<file regress, line 8, column 33> Invalid scalar projection: b : A column
needs to be projected from a relation for it to be used as a scalar
Details at logfile: /var/log/pig/pig_1320887043189.log

Just wondering if this is a known issue, or if I should make a jira?