[perl #133107] LTA: require of non installed module

# New Ticket Created by  Martin Barth 
# Please include the string:  [perl #133107]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=133107 >


requireing a non installed module leads to strange error if the name 
starts with the name of a core module. e.g:


 > perl6 -e 'require IO::Socket::Async::SSL'
IO::Socket::Async::SSL is a builtin type, not an external module
   in block <unit> at -e line 1