[perl #122815] [BUG] nativecall sub declaration complains about 'returns' type when type has been predeclared using yadda-yadda on Rakudo Moar

[Brian S. Julin via RT]

Golf and change of behavior:

$ perl6 -e 'use NativeCall; class T is repr<CPointer> is export { sub 
new(size_t $n) returns T is symbol<malloc> is native { * }; }; T.new();'
$ perl6 -e 'use NativeCall; class T {...}; class T is repr<CPointer> is export 
{ sub new(size_t $n) returns T is symbol<malloc> is native { * }; }; T.new();'
===SORRY!=== Error while compiling -e
Cannot change REPR of T now (must be set at initial declaration)
at -e:1

Workaround:

$ perl6 -e 'use NativeCall; class T is repr<CPointer> {...}; class T is export 
{ sub new(size_t $n) returns T is symbol<malloc> is native { * }; }; T.new(); 
say T.REPR;'
CPointer