NParserError@(1:5-1:6)='d'
Nodes[Node]
  'a'@(1:1-1:2)
  'b'@(1:2-1:3)
  'c'@(1:3-1:4)
  s
    'd'@(1:4-1:5)
  'd'@(1:5-1:6)