• Simon Peyton Jones's avatar
    Remove "silent superclass parameters" · a9d48fd9
    Simon Peyton Jones authored
    We introduced silent superclass parameters as a way to avoid
    superclass loops, but we now solve that problem a different
    way ("derived" superclass constraints carry no evidence). So
    they aren't needed any more.
    Apart from being a needless complication, they broke DoCon.
    Admittedly in a very obscure way, but still the result is
    hard to explain. To see the details see Trac #5051, with
    test case typecheck/should_compile/T5051.  (The test is
    nice and small!)
TcInteract.lhs 93.8 KB