As Joa Ebert mentioned before for FDT 3.5:
If an internal class is not visible from within the current scope, AutoCompletion should not contain the proposal.
(see ticket: http://bugs.powerflasher.com/jira/browse/FDT-681
)
This bug still exists in FDT5!
When you type "impl" is gets auto-completed with "implementsXml" which is an internal var in "avmplus".
Please fix this, since this is very annoying!