# Buggy code
def p_string_literal(self, p):
    """string_literal : string_tok"""
    p1 = p[1]
    prefix = RE_STRINGPREFIX.match(p1.value).group()
    if "p" in prefix:
        value_without_p = prefix.replace("p", "") + p1.value[len(prefix) :]
        s = ast.Str(
            s=ast.literal_eval(value_without_p),
            lineno=p1.lineno,
            col_offset=p1.lexpos,
        )
        p[0] = xonsh_call(
            "__xonsh_path_literal__", [s], lineno=p1.lineno, col=p1.lexpos
        )
    elif "f" in prefix or "F" in prefix:
        s = pyparse(p1.value).body[0].value
        s = ast.increment_lineno(s, p1.lineno - 1)
        p[0] = s
    else:
        s = ast.literal_eval(p1.value)
        is_bytes = "b" in prefix or "B" in prefix
        cls = ast.Bytes if is_bytes else ast.Str
        p[0] = cls(s=s, lineno=p1.lineno, col_offset=p1.lexpos)


# Traceback (ValueError)
 f""Exception in thread Thread-2566:
Traceback (most recent call last):
File "/usr/lib/python3.7/threading.py", line 917, in _bootstrap_inner
self.run()
File "/usr/lib/python3.7/threading.py", line 865, in run
self._target(*self._args, **self._kwargs)
File "/usr/lib/python3.7/site-packages/prompt_toolkit/interface.py", line 865, in run
completions = list(buffer.completer.get_completions(document, complete_event))
File "/usr/lib/python3.7/site-packages/xonsh/ptk/completer.py", line 45, in get_completions
prefix, line_ex, begidx + expand_offset, endidx + expand_offset, self.ctx
File "/usr/lib/python3.7/site-packages/xonsh/__amalgam__.py", line 125, in complete
out = func(prefix, line, begidx, endidx, ctx)
File "/usr/lib/python3.7/site-packages/xonsh/completers/__amalgam__.py", line 1274, in complete_path
p = _path_from_partial_string(line, end)
File "/usr/lib/python3.7/site-packages/xonsh/completers/__amalgam__.py", line 1064, in _path_from_partial_string
val = ast.literal_eval(_string)
File "/usr/lib/python3.7/ast.py", line 91, in literal_eval
return _convert(node_or_string)
File "/usr/lib/python3.7/ast.py", line 90, in _convert
return _convert_signed_num(node)
File "/usr/lib/python3.7/ast.py", line 63, in _convert_signed_num
return _convert_num(node)
File "/usr/lib/python3.7/ast.py", line 55, in _convert_num
raise ValueError('malformed node or string: ' + repr(node))
ValueError: malformed node or string: <_ast.JoinedStr object at 0x7f82d1549d68>

# Fixed code
def p_string_literal(self, p):
    """string_literal : string_tok"""
    p1 = p[1]
    prefix = RE_STRINGPREFIX.match(p1.value).group()
    if "p" in prefix:
        value_without_p = prefix.replace("p", "") + p1.value[len(prefix) :]
        s = ast.Str(
            s=ast.literal_eval(value_without_p),
            lineno=p1.lineno,
            col_offset=p1.lexpos,
        )
        p[0] = xonsh_call(
            "__xonsh_path_literal__", [s], lineno=p1.lineno, col=p1.lexpos
        )
    elif "f" in prefix or "F" in prefix:
        s = sub_env_vars(p1.value)
        s = pyparse(s).body[0].value
        s = ast.increment_lineno(s, p1.lineno - 1)
        p[0] = s
    else:
        s = ast.literal_eval(p1.value)
        is_bytes = "b" in prefix or "B" in prefix
        cls = ast.Bytes if is_bytes else ast.Str
        p[0] = cls(s=s, lineno=p1.lineno, col_offset=p1.lexpos)