var strings: string[];
var numbers: number[];

(strings || numbers).pop();

Go to definition on pop causes the following crash:

TypeError: Unable to get property 'parent' of undefined or null reference
at resolveLocation (:14288:18)
at getTypeOfSymbolAtLocation (:14306:13)
at getSymbolKindOfConstructorPropertyMethodAccessorFunctionOrVar (:22929:25)
at getSymbolKind (:22877:13)
at getDefinitionAtPosition (:23395:13)
at Anonymous function (:25791:17)
at simpleForwardCall (:25646:9)
at forwardJSONCall (:25660:13)
at forwardJSONCall (:25691:13)
at getDefinitionAtPosition (:25790:13)