C:\>perl -e "say 'ok';"
String found where operator expected at -e line 1, near "say 'ok'"
        (Do you need to predeclare say?)
syntax error at -e line 1, near "say 'ok'"
Execution of -e aborted due to compilation errors.

C:\>perl -Mfeature="say" -e "say 'ok';"
ok

C:\>perl -E "say 'ok';"
ok

C:\