Haskell is complex,

No one has ever given a precise semantics for all the little
corners such as, nested patterns, lazy pattern matching, guards etc.

Why in Haskell?
  common vocabulary
      easier for Haskell programmers to understand
      
  executable
      Part of the programatica project (worlds slowest haskell implementation)
      
  unlike the haskell report gives a finer grain definition
  
  Standard against which to compare other implementations
  
  Introduce examples which illustrate the subtleties
  
Format 

0) Whats wrong with other descriptions
        patterns are always simple
        distinction between case, let, lambda, lazy patterns
        Sematics as translation introduces Variable introduction problem
        Guards are subtle, they may force unnecesary evaluation
        

1) Why a Monadic description?
   what monad?

2) Call by name vs lazy description

3) The meaning of patterns
        Different uses of patterns
        case, let, lambda
        Lazy patterns
        nested patterns
        
4) Guards

5) Other things
        Strict Data constructors
        newtypes and lifting
        
6) Type classes, 
        suggestion library introduction transform
        
7)