[cvs-nhc98] patch applied (hat): Improve the error message for incorrect newtypes, e.g.

Mon Jan 6 08:45:22 PST 2003 malcolm * Improve the error message for incorrect newtypes, e.g. newtype N = N a b => Invalid rhs of newtype N, a newtype can rename only one type. M ./src/compiler98/RenameLib.hs +4