$ perl -MO=Deparse
print (two + two == five ? "true" : "false")
^Z
print two 'two' == 'five' ? 'true' : 'false';
- syntax OK

$ perl -MO=Deparse,-p
print (two + two == five ? "true" : "false")
^Z
print(two (('two' == 'five') ? 'true' : 'false'));
- syntax OK

$ perl -w
print (two + two == five ? "true" : "false")
print (...) interpreted as function at - line 1.
Unquoted string "two" may clash with future reserved word at - line 1.
Unquoted string "two" may clash with future reserved word at - line 1.
Unquoted string "five" may clash with future reserved word at - line 1.
^Z
Name "main::two" used only once: possible typo at - line 1.
Argument "five" isn't numeric in numeric eq (==) at - line 1.
Argument "two" isn't numeric in numeric eq (==) at - line 1.
print() on unopened filehandle two at - line 1.