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Synopsis Apply a function to all list elements and return list of results.
Function list[&U] mapper(list[&T] lst, &U (&T) fn)
Usage import List;
Description Apply a function fn to each element of lst and return the list of results.
Examples 
rascal>import List;
ok
rascal>int incr(int x) { return x + 1; }
int (int): int incr(int);
rascal>mapper([1, 2, 3, 4], incr);
list[int]: [2,3,4,5]

Questions
Question [1].
Given 
int incr(int x) { return x + 1; }
The type of mapper([18, 17, -14], incr) is

Question [2].
Given 
int incr(int x) { return x + 1; }

mapper([14, 9, -12, -14], incr) ==



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