Mypy fails when buffer is not yet saved

[relaxdiego]

When creating a new file via the command nvim /path/to/nonexistent.py, mypy fails with the following error:

mypy: can't read file '/path/to/nonexistent.py': No such file or directory

Looking at the code, it looks like it's due to the following arguments, specifically the params.bufname parts.

null-ls.nvim/lua/null-ls/builtins/diagnostics/mypy.lua

Lines 26 to 41 in db09b6c

	args = function(params)
	return {
	"--hide-error-codes",
	"--hide-error-context",
	"--no-color-output",
	"--show-absolute-path",
	"--show-column-numbers",
	"--show-error-codes",
	"--no-error-summary",
	"--no-pretty",
	"--shadow-file",
	params.bufname,
	params.temp_path,
	params.bufname,
	}
	end,

Should the the builtin first try to save the buffer to a temporary file if it finds that the file doesn't yet exist?