resourcing config file doesn't work as function. why?

``` bash
$ type resource
resource is a function with definition
function resource
        source ~/.config/fish/config.fish
end
```

why doesn't this actually work to re-source the file again?

I edit the config.fish file, and add a `set -x BLAH foo` for instance, but running `resource` will not honor it, and I have to run `source ~/.config/fish/config.fish` manually
