{"textDocument": {"version": 2, "uri": "file:///editCompletion.lean"},
 "contentChanges":
 [{"text": ".",
   "range":
   {"start": {"line": 3, "character": 21},
    "end": {"line": 3, "character": 22}}}]}
{"textDocument": {"uri": "file:///editCompletion.lean"},
 "position": {"line": 3, "character": 22}}
{"items":
 [{"sortText": "0",
   "label": "foo",
   "kind": 5,
   "data":
   {"params":
    {"textDocument": {"uri": "file:///editCompletion.lean"},
     "position": {"line": 3, "character": 22}},
    "id": {"const": {"declName": "Foo.foo"}}}}],
 "isIncomplete": true}