Changes between Version 226 and Version 227 of TypeFunctionsStatus


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Timestamp:
Sep 28, 2007 1:39:05 PM (7 years ago)
Author:
chak
Comment:

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  • TypeFunctionsStatus

    v226 v227  
    5555 0. CONCEPTUAL issue: At least with `skolemOccurs`, the policy of not zonking the types embedded in the kinds of coercion type variables does no longer work.  This becomes, for example in the test `Simple13`, apparent.  The skolem introduced in `skolemOccurs` finds its way into variable kinds (which is visible when inspecting them during `TcMType.zonk_tc_tyvar`). 
    5656 0. When `Simple13` is compiled with a compiler that was built with `-DDEBUG`, it prints a warning about not matching types being used during constructing a trans coercion. 
     57 0. To fix superclass equalities (specifically getting the coercion evidence), we could introduce a kind of typelet just for evidence.  In fact, re-use HsBind.VarBind and make its right-hand side a specially data structure describing evidence construction, instead of being a general HsExpr.  That evidence construction generation can have a case for extracting superclass constraints.  The desugarer than has to generate the case expression bringing the equality in scope from that. 
    5758 0. In `TcTyFuns.genericNormaliseInst`, we need to figure out what to do with `ImplicInst`, `Method`, and `LitInst` dictionaries. 
    5859 0. ghc falls over if a bang pattern is put at an argument of type `F a`.