[perl #127813] "Bytecode validation error at offset ..., instrucction ..., operand type 160 does not match register type 152"

[via RT]

# New Ticket Created by  Salvador Ortiz 
# Please include the string:  [perl #127813]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=127813 >


In code like:

class Foo is repr('CPointer') {
   ...
   method Bar(:named, :named2, uint32 :mode) { 
      ...
   }
   ...

Calling Bar, at runtime is produced the error in the subject. The offset and 
the instruction varies, but removing
the 'uint32' constraint fixes that.