haskell98- Compatibility with Haskell 98

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getCPUTime :: IO IntegerSource

Computation getCPUTime returns the number of picoseconds CPU time used by the current program. The precision of this result is implementation-dependent.

cpuTimePrecision :: IntegerSource

The cpuTimePrecision constant is the smallest measurable difference in CPU time that the implementation can record, and is given as an integral number of picoseconds.