if (null == _node) {
// ignore
}
else if (_node instanceof ExpressionNodeForLetVar) {
final ExpressionNodeForLetVar letVar = (ExpressionNodeForLetVar) _node;
final LetEntry found = letDict().find( letVar.varName() );
if (null != found && INNER_DEF != found.value) {
// Don't treat repeated occurrences separately.
_closure.put( found.name, found );
}
}