Locations in script with negative offset.
[
    [0] : {
        columnNumber : 16
        lineNumber : 0
        scriptId : <scriptId>
        type : debuggerStatement
    }
    [1] : {
        columnNumber : 26
        lineNumber : 0
        scriptId : <scriptId>
        type : return
    }
]
foo (:-1:16)
(anonymous) (:0:0)
boo (:0:16)
(anonymous) (:0:0)