"pos" is different (not a dict) with literal dicts

[blueyed]

Given t1.vim:

let mydict = #{one: 0}

Given t2.vim:

let mydict = {"one": 0}

Printing node in parse_expr9 shows:

{'type': 83, 'pos': {'i': 13, 'lnum': 1, 'col': 14, 'offset': 13}, 'value': [[{'type': 81, 'pos': 15, 'value': "'one'"}, {'type': 80, 'pos': {'i': 20, 'lnum': 1, 'col': 21, 'offset': 20}, 'value': '0'}]]} {'i': 13, 'lnum': 1, 'col': 14, 'offset': 13}

vs

{'type': 83, 'pos': {'i': 13, 'lnum': 1, 'col': 14, 'offset': 13}, 'value': [[{'type': 81, 'pos': {'i': 14, 'lnum': 1, 'col': 15, 'offset': 14}, 'value': '"one"'}, {'type': 80, 'pos': {'i': 21, 'lnum': 1, 'col': 22, 'offset': 21}, 'value': '0'}]]} {'i': 13, 'lnum': 1, 'col': 14, 'offset': 13}

Note that "pos" for the key is a dict in the second case, but only a number in the first one.

Related code:

vim-vimlparser/autoload/vimlparser.vim

Lines 4213 to 4218 in 9cc29ee

	function! s:ExprParser.parse_dict_literal_key() abort
	let node = s:Node(s:NODE_STRING)
	let node.pos = self.reader.tell()
	let node.value = "'" . self.tokenizer.get_dict_literal_key() . "'"
	return node
	endfunction

This causes an error in Vint then, which expects a dict there: Vimjas/vint#339.

/cc @tyru (via #110)