Compiler complains about duplicate instance declarations

[Volker Wysk]

Hi

I've attached a minimal example, which makes the compiler complain in error 
about multiple instance declarations. Run "make" twice.

~/src/hsskripte/bugrep $ make
ghc --make mtest.hs
Chasing modules from: mtest.hs
Compiling Schema           ( ./Schema.hs, ./Schema.o )
Compiling Datenbank        ( ./Datenbank.hs, ./Datenbank.o )
Compiling Main             ( mtest.hs, mtest.o )
Linking ...

~/src/hsskripte/bugrep $ make
ghc --make mtest.hs
Chasing modules from: mtest.hs
Skipping  Schema           ( ./Schema.hs, ./Schema.o )
Skipping  Datenbank        ( ./Datenbank.hs, ./Datenbank.o )

Duplicate instance declarations:
  In module Datenbank: GHC.Base.Eq Datenbank.Praedikat
  In module Datenbank: GHC.Base.Eq Datenbank.Praedikat

Duplicate instance declarations:
  In module Datenbank: GHC.Show.Show Datenbank.Praedikat
  In module Datenbank: GHC.Show.Show Datenbank.Praedikat
make: *** [mtest] Fehler 1

Greetings,
Volker
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