[perl #114216] Type captures in a bare signatures lead to internal errors

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# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #114216]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=114216 >


17:11 < moritz> r: :(::T $x)
17:11 <+p6eval> rakudo 4eeffc: OUTPUT«use of uninitialized value of type
Mu in string context  in any <anon> at src/gen/BOOTSTRAP.pm:104␤␤use of
uninitialized value of type Mu in string context  in any <anon> at
src/gen/BOOTSTRAP.pm:104
␤===SORRY!===␤error:imcc:Sub '11_1342797070.34498' not found␤␤     in …