typo in error message: duplicate "the"

[Christian Maeder]

The following error message just contains a typo before "existential
context".

Cheers Christian


Compiling Syntax           ( Syntax.hs, ./Syntax.o )

Syntax.hs:56:
    Could not deduce (Institution id1 basic_spec1 local_env1,
                      Institution id basic_spec local_env)
        from the context (Syntax id basic_spec, Syntax id1 basic_spec1)
    Probable fix:
        Add (Institution id1 basic_spec1 local_env1,
             Institution id basic_spec local_env)
        to the the existential context of a data constructor
>          ^^^^^^^    
    arising from use of `basic_analysis' at Syntax.hs:56
    In the definition of `analyse':
        (basic_analysis l1 b1, basic_analysis l2 b2)