try

try x else y -- returns the value of x unless an error or alarm occurs during the evaluation of x, in which case it returns the value of y.
try x -- returns the value of x unless an error or alarm occurs during the evaluation of x, in which case it returns null.

The behavior of interrupts (other than alarms) is unaffected.

     i1 = apply(-3..3,i->try 1/i else infinity)
     
           1  1               1 1
     o1 = --,--,-1,infinity,1,-,-
           3  2               2 3
     
     o1 : Sequence

We will change the behavior of this function soon so that it will be possible to catch errors of a particular type. Meanwhile, users are recommended to use this function sparingly, if at all.

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