The problem is actually caused by the error reporting:

The only heuristic I’ve been able to find so far that the value of $ns{$_} 
suddenly is no longer fully qualified if the namespace doesn’t exist.  I guess 
we can build some heuristic check on that, but it feels fragile.  Perhaps nine 
/ ugexe / jnthn have a better idea about that.

> On 13 Apr 2018, at 08:34, Martin Barth (via RT) 
> <> wrote:
> # New Ticket Created by  Martin Barth 
> # Please include the string:  [perl #133107]
> # in the subject line of all future correspondence about this issue. 
> # <URL: >
> 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

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