P:\test> perl -wle"prnit 'hello world';"
Unquoted string "prnit" may clash with future reserved word at -e line 1.
String found where operator expected at -e line 1, near "prnit 'hello world'"
        (Do you need to predeclare prnit?)
syntax error at -e line 1, near "prnit 'hello world'"
Execution of -e aborted due to compilation errors.