java.util.List<IMatchingResult> kids = new java.util.ArrayList<IMatchingResult>(alts.size());
for (org.rascalmpl.ast.Expression arg : alts) {
kids.add(arg.buildMatcher(eval));
}
IMatchingResult setMatcher = new SetPattern(eval, this, kids);
java.util.List<IMatchingResult> wrap = new ArrayList<IMatchingResult>(1);
wrap.add(setMatcher);
Result<IValue> ambCons = eval.getCurrentEnvt().getVariable("amb");
return new NodePattern(eval, this, new LiteralPattern(eval, this, ambCons.getValue()), null, Factory.Tree_Amb, wrap, Collections.<String,IMatchingResult>emptyMap());