randomRIO panic on (GHC version 8.4.3 for x86_64-apple-darwin)

randomRIO (1,100) ghc: panic! (the 'impossible' happened)

(GHC version 8.4.3 for x86_64-apple-darwin):

nameModule

system $dShow_a78p

Call stack:

CallStack (from HasCallStack):

callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable

pprPanic, called at compiler/basicTypes/Name.hs:241:3 in ghc:Name

Edited Mar 10, 2019 by Ben Gamari

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