From martin@senfdax.de

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

From @lizmat

The problem is actually caused by the error reporting​:

https://github.com/rakudo/rakudo/blob/08b951c8f33cfc702c308e64efcb44f3ec725117/src/core/Exception.pm6#L2969

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) <perl6-bugs-followup@​perl.org> 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​: https://rt-archive.perl.org/perl6/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

The RT System itself - Status changed from 'new' to 'open'

From @zoffixznet

On Thu, 12 Apr 2018 23​:34​:43 -0700, martin@​senfdax.de wrote​:

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

Thank you for the report. This is now fixed.

Fix​: rakudo/rakudo@4b2512a22236e09
Test​: rakudo/rakudo@4b2512a22236e09

@zoffixznet - Status changed from 'open' to 'resolved'