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TooManyDeltas.hs:14:1: warning: [-Wincomplete-patterns (in -Wextra)]
    Pattern match(es) are non-exhaustive
    In an equation for ‘f’:
        Patterns of type  ‘T’, ‘T’ not matched:
            A A
            A B
            B A
            B B

TooManyDeltas.hs:14:1: warning:
    Pattern match checker ran into -fmax-pmcheck-models=0 limit, so
      • Redundant clauses might not be reported at all
      • Redundant clauses might be reported as inaccessible
      • Patterns reported as unmatched might actually be matched
    Increase the limit or resolve the warnings to suppress this message.

TooManyDeltas.hs:19:1: warning:
    Pattern match checker ran into -fmax-pmcheck-models=0 limit, so
      • Redundant clauses might not be reported at all
      • Redundant clauses might be reported as inaccessible
      • Patterns reported as unmatched might actually be matched
    Increase the limit or resolve the warnings to suppress this message.

TooManyDeltas.hs:20:1: warning: [-Woverlapping-patterns (in -Wdefault)]
    Pattern match has inaccessible right hand side
    In an equation for ‘g’: g A A = ...

TooManyDeltas.hs:21:1: warning: [-Woverlapping-patterns (in -Wdefault)]
    Pattern match has inaccessible right hand side
    In an equation for ‘g’: g A A = ...