Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the highest index i such that (o == null ? get(i) == null : o.equals(get(i))) or -1 if there is no such index.

int LastIndexOf(
	T o
)

Function LastIndexOf ( 
	o As T
) As Integer

int LastIndexOf(
	T o
)

abstract LastIndexOf : 
        o : 'T -> int