add warnings not to edit auto-generated Prim.hs file.
add warnings not to edit auto-generated Prim.hs file.

Ignore-this: 8ea3a7ae45154a7065dd3c6cca027d21b0fd6d14

darcs-hash:20090905163828-64b53-31325aa18235480679f6075d421580d4f4a058b8

kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc,kirbyfan64/jhc