sem.dcl

   1 definition module sem
   2
   3 import qualified Data.Map as Map
   4 from Data.Either import :: Either
   5 from AST import :: AST, :: Pos, :: Type, :: FieldSelector, :: Op2
   6 from StdOverloaded import class toString
   7
   8 :: SemError
   9         = ParseError Pos String
  10         | UnifyError Pos Type Type
  11     | FieldSelectorError Pos Type FieldSelector
  12         | OperatorError Pos Op2 Type
  13     | UndeclaredVariableError Pos String
  14         | Error String
  15 :: Gamma
  16 :: SemOutput :== Either [SemError] (AST, Gamma)
  17
  18 instance toString SemError
  19 instance toString Gamma
  20
  21 sem :: AST -> SemOutput