heredoc parsing in function cause strange extra results

[bamanzi]

for the code as following

code = '''cat << EOF
abc
def
EOF'''
ret = bashlex.parse(code)
print(ret[0].dump())

we got:

CommandNode(pos=(0, 9), parts=[
  WordNode(pos=(0, 3), word='cat'),
  RedirectNode(heredoc=
    HeredocNode(pos=(10, 21), value='abc\ndef\nEOF'), output=
    WordNode(pos=(6, 9), word='EOF'), pos=(4, 21), type='<<'),
])

that's fine so far.

but for the code:

code = '''function foo () {
cat << EOF
abc
def
EOF
}'''
ret = bashlex.parse(code)
print(ret[0].dump())

we got:

FunctionNode(pos=(0, 40), parts=[
  ReservedwordNode(pos=(0, 8), word='function'),
  WordNode(pos=(9, 12), word='foo'),
  ReservedwordNode(pos=(12, 13), word='('),
  ReservedwordNode(pos=(13, 14), word=')'),
  CompoundNode(list=[
    ReservedwordNode(pos=(15, 16), word='{'),
    ListNode(pos=(17, 39), parts=[
        CommandNode(pos=(17, 26), parts=[
          WordNode(pos=(17, 20), word='cat'),
          RedirectNode(heredoc=
            HeredocNode(pos=(31, 38), value='def\nEOF'), output=
            WordNode(pos=(23, 26), word='EOF'), pos=(21, 26), type='<<'),
        ]),
        OperatorNode(op='\n', pos=(26, 27)),
        CommandNode(pos=(27, 30), parts=[
          WordNode(pos=(27, 30), word='abc'),
        ]),
        OperatorNode(op='\n', pos=(30, 39)),
      ]),
    ReservedwordNode(pos=(39, 40), word='}'),
  ], pos=(15, 40)),
])

in this case, abc no longer a part of the heredoc, but came out as a standalone CommandNode.