Add location information to arithmetic parse error

core/tdop.py

@@ -72,8 +72,7 @@ def ToLValue(node):
        node.left.tag == arith_expr_e.ArithVarRef):
      return ast.LhsIndexedName(node.left.name, node.right)

  # TODO: Location information needs token instead of op_id.
  p_die("Can't assign to %r", node)
  return None


#
@@ -133,6 +132,8 @@ def LeftAssign(p, w, left, rbp):
  """ Normal binary operator like 1+2 or 2*3, etc. """
  # x += 1, or a[i] += 1
  lhs = ToLValue(left)
  if lhs is None:
    p_die("Can't assign to %r", lhs, word=w)
  return ast.BinaryAssign(word.ArithId(w), lhs, p.ParseUntil(rbp))