Changes between Version 40 and Version 41 of TypeFunctions
- Aug 8, 2006 11:34:43 PM (10 years ago)
v40 v41 30 30 * Applications of indexed types need to supply all indexes; i.e., partial application to indexes is not admitted. (Arguments beyond the indexes can be partially supplied as usual.) 31 31 * Instances of indexed data types/newtypes and equations of type functions have the same form as vanilla data types/newtypes and type synonyms, respectively, but can have non-variable type indexes in index positions. Type indexes can include applications of indexed data types and newtypes, but no type functions. 32 * Instances of indexed data types and new types as well as type equations are only valid if a matching kind signature is in scope. 32 * Instances of indexed . 33 33 * The degenerate case of a data type/newtype declaration or type equation where all type parameters are variables is valid without a kind signature and coincides with the data types and type synonyms of vanilla Haskell. In fact, for the moment, we do not allow the degenerate case to have a kind signature. The latter constraint could be dropped if it proves to be inconvenient. (Rationale: Multiple type equations are useless when one is degenerate - as the whole system needs to be confluent and we don't have sequential matching on type equations. So, we get backwards compatibility for free.) 34 34 * All type indexes of an associated indexed type or type function need to be class parameters.