[cvs-nhc98] patch applied (hat): Hat-trans: added / improved error messages for faulty input module.

[Malcolm Wallace]

Tue Jun 11 03:41:21 PDT 2002  olaf
  * Hat-trans: added / improved error messages for faulty input module.
  
  This also removes the following bug:
  
  3. hat-trans suffers a pattern-match failure if the source
     program has an empty import list
  
  Actually the pattern-match failure had nothing to do with an empty import list. It occurred when a data constructor that was not in scope occurred in a pattern.

    M ./src/compiler98/AuxFile.hs +1
    M ./src/compiler98/AuxLabelAST.hs -3 +4
    M ./src/compiler98/Makefile -3 +1
    M ./src/compiler98/TraceTrans.hs -2 +2
    M ./src/hattrans/AuxFile.hs +1
    M ./src/hattrans/AuxLabelAST.hs -3 +4
    M ./src/hattrans/TraceTrans.hs -2 +2