{"textDocument": {"uri": "file:///rename.lean"},
 "position": {"line": 5, "character": 14}}
null
{"textDocument": {"uri": "file:///rename.lean"},
 "position": {"line": 5, "character": 14},
 "newName": "blue"}
{"changes": {}}
{"textDocument": {"uri": "file:///rename.lean"},
 "position": {"line": 9, "character": 10},
 "newName": "Bar"}
{"changes": {}}
{"textDocument": {"uri": "file:///rename.lean"},
 "position": {"line": 23, "character": 6},
 "newName": "z"}
{"changes": {}}
{"textDocument": {"uri": "file:///rename.lean"},
 "position": {"line": 30, "character": 12},
 "newName": "X"}
{"changes": {}}