code: def expr_stmt(self, lhs, rhs):
          
          if isinstance(rhs, ast.AugAssign):
              if isinstance(lhs, ast.Tuple) or isinstance(lhs, ast.List):
                  error = diagnostic.Diagnostic(
                      "fatal", "illegal expression for augmented assignment", {},
                      rhs.op.loc, [lhs.loc])
                  self.diagnostic_engine.process(error)
              else:
                  rhs.target = self._assignable(lhs)
                  rhs.loc = rhs.target.loc.join(rhs.value.loc)
                  return rhs
          elif rhs is not None:
              rhs.targets = list(map(self._assignable, [lhs] + rhs.targets))
              rhs.loc = lhs.loc.join(rhs.value.loc)
              return rhs
          else:
              return ast.Expr(value=lhs, loc=lhs.loc)
docs: (2.6, 2.7, 3.0, 3.1)
          expr_stmt: testlist (augassign (yield_expr|testlist) |
                               ('=' (yield_expr|testlist))*)
          (3.2-)
          expr_stmt: testlist_star_expr (augassign (yield_expr|testlist) |
                               ('=' (yield_expr|testlist_star_expr))*)