Setting filetype via function_complex has no effect

[ghillb]

Hi! After reading the Readme I thought the following two configs should essentially do the same. But they don't.

This sets the filetype to gitlab-ci, when opening .gitlab-ci.yml:

vim.g.did_load_filetypes = 1
require('filetype').setup({
  overrides = {
    extensions = {
    },
    literal = {
    },
    complex = {
      [".*gitlab.*yml"] = "gitlab-ci",
    },
  }
})

This does not:

vim.g.did_load_filetypes = 1
require('filetype').setup({
  overrides = {
    function_extensions = {
    },
    function_literal = {
    },
    function_complex = {
      [".*gitlab.*yml"] = function()
        vim.bo.filetype = 'gitlab-ci'
      end
    },
  }
})

I'm using nvim 5.1.