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END Terminate scope of FOR, WHILE, SWITCH, TRY, and IF statements.
    Without END's, FOR, WHILE, SWITCH, TRY, and IF wait for further input.
    Each END is paired with the closest previous unpaired FOR, WHILE,
    SWITCH, TRY or IF and serves to terminate its scope.
 
    END can also serve as the last index in an indexing expression.  In
    that context, END = SIZE(X,k) when used as part of the k-th index.
    Examples of this use are, X(3:end) and X(1,1:2:end-1).  When using END
    to grow an array, as in X(end+1) = 5, make sure X exists first.
 
    END(A,K,N) is called for indexing expressions involving the object A
    when END is part of the K-th index out of N indices.  For example,
    the expression A(end-1,:) calls A's END method with END(A,1,2).