úΦ6None$Fetch an environment variable using P. This is done only once per program run because CAFs are evaluated only once.RTrace only if an environment variable is set and its value satisfies a predicate.Trace only if the DEBUG environment variable is set to TRUE. $tracy-0.1.4.0-JiC17bh5HFWIywOZBl8NB8 Debug.Tracy makeTracytracytracyMftracyftracyApftracyMunsafeLookupEnvbase GHC.IO.UnsafeunsafePerformIO