[reanalyze] [bug] nested functions trigger @raises annotation

[tx46]

repro:

exception MyException
let foo = () => {
  @raises(MyException)
  let bar = () => {
    throw(MyException)
  }
  {"bar": bar}
}

it's trivial to see above that foo can never raise MyException. despite this, reanalyze exception analysis suggests that foo should be annotated:

{
  "name": "Exception Analysis",
  "kind": "warning",
  "file": "Foo.res",
  "range": [21,4,21,7],
  "message": "foo might raise MyException (Foo.res:27:10) and is not annotated with @raises(MyException)",
  "annotate": { "line": 21, "character": 0, "text": "@raises(MyException)\n", "action": "Add @raises annotation"}
}

this is incorrect and the annotation should not be suggested.