G'day nottux,

Welcome to the Monastery.

I don't know what you intended. I suspect you're missing characters or have incorrect characters. What you've actually got here is:

1. 120*312-77728 -- an arithmetical expression
2. + -- added to
3. 2.22772.224792222 -- v-string (as a package name)
4. -> -- calling method
5. x -- x

Take a look at "perldata: Version Strings"; noting "If there are two or more dots in the literal, the leading v may be omitted."