$ perl -wMstrict -le 'print (  STDOUT  "42") + 1'
print (...) interpreted as function at -e line 1.
Useless use of addition (+) in void context at -e line 1.
42
$ perl -wMstrict -le 'print ({*STDOUT} "42") + 1'
print (...) interpreted as function at -e line 1.
Useless use of addition (+) in void context at -e line 1.
42