Test octal warnings in REPL
Test octal warnings in REPL

RT#119339

- 0-prefixed number must warn about usin 0o prefix
- This warning must not suggest the user uses invalid octal, e.g. 0o9
- 0o prefix on valid octal must work in REPL

zostay/roast,dogbert17/roast,bitrauser/roast,perl6/roast,zostay/roast,zostay/roast,dogbert17/roast,bitrauser/roast