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    perl -wle 'print ("foo")'    # Warning
    perl -wle 'print ("foo");'   # No warning
    perl -wle 'print (")");'     # Warning
    perl -wle 'print ("\x29");'  # No warning

$ perl -wle 'print ("foo") . "bar"'
print (...) interpreted as function at -e line 1.
Useless use of concatenation (.) or string in void context at -e line 
+1.
foo
$ perl -wle 'my $s = length ("foo") . "bar"'