function in conditional expression generates parse error

[Kapil Thangavelu]

❯ cat locals.tf 
locals {
  raw_bucket_name        = var.bucket != "" ? var.bucket : "stacklet-platform-${md5("${data.aws_caller_identity.current.account_id}-${data.aws_region.current.name}")}"
}

    tf_data = hcl2.loads(tf.read_text())
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/hcl2/api.py", line 18, in loads
    return hcl2.parse(text + "\n")
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/lark.py", line 464, in parse
    return self.parser.parse(text, start=start)
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/parser_frontends.py", line 115, in parse
    return self._parse(token_stream, start)
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/parser_frontends.py", line 63, in _parse
    return self.parser.parse(input, start, *args)
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/parsers/lalr_parser.py", line 35, in parse
    return self.parser.parse(*args)
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/parsers/lalr_parser.py", line 88, in parse
    action, arg = get_action(token)
  File "/home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/parsers/lalr_parser.py", line 66, in get_action
    raise UnexpectedToken(token, expected, state=state, puppet=puppet)
lark.exceptions.UnexpectedToken: Unexpected token Token('RPAR', ')') at line 2, column 165.
Expected one of: 
        * __ANON_0
        * __ANON_2
        * LESSTHAN
        * __ANON_4
        * QMARK
        * __ANON_3
        * __ANON_9
        * RBRACE
        * SLASH
        * STAR
        * __ANON_5
        * MINUS
        * __ANON_1
        * PERCENT
        * __ANON_6
        * PLUS
        * __ANON_8
        * __ANON_7
        * MORETHAN

> /home/kapilt/.pyenv/versions/tfresurrect/lib/python3.9/site-packages/lark/parsers/lalr_parser.py(66)get_action()
-> raise UnexpectedToken(token, expected, state=state, puppet=puppet)

versions:
python3.9.4
lark-parser==0.10.1
python-hcl2==2.0.3