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Move exception handling closer to call

Merged Bernhard M. Wiedemann requested to merge bmwiedemann-guest/strip-nondeterminism:perlread into master

Move exception handling closer to call using perl's // operator (explained in man perlop)

Logical Defined-Or
   Although it has no direct equivalent in C, Perl's "//" operator is
   related to its C-style "or".  In fact, it's exactly the same as "||",
   except that it tests the left hand side's definedness instead of its
   truth.  Thus, "EXPR1 // EXPR2" returns the value of "EXPR1" if it's
   defined, otherwise, the value of "EXPR2" is returned.

requires perl 5.10 from 2007