InProgressException.this - multiple declarations

Function InProgressException.this

this (
  string msg,
  string file = __FILE__,
  ulong line = cast(ulong)__LINE__,
  object.Throwable next = null
) pure;

Function InProgressException.this

this (
  string msg,
  object.Throwable next,
  string file = __FILE__,
  ulong line = cast(ulong)__LINE__
);