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T2245.hs:4:10: Warning:
    No explicit implementation for
      ‘+’, ‘*’, ‘abs’, ‘signum’, ‘fromInteger’, and (either ‘negate’
                                                            or
                                                            ‘-’)
    In the instance declaration for ‘Num T’

T2245.hs:5:10: Warning:
    No explicit implementation for
      ‘fromRational’ and (either ‘recip’ or ‘/’)
    In the instance declaration for ‘Fractional T’

T2245.hs:7:38: Warning:
    Defaulting the following constraint(s) to type ‘T’
      (Read b0) arising from a use of ‘read’ at T2245.hs:7:38-41
      (Ord b0) arising from a use of ‘<’ at T2245.hs:7:27
      (Fractional b0)
        arising from the literal ‘1e400’ at T2245.hs:7:29-33
    In the second argument of ‘(.)’, namely ‘read’
    In the second argument of ‘(.)’, namely ‘(< 1e400) . read’
    In the second argument of ‘($)’, namely ‘show . (< 1e400) . read’