:: String -> Int is:exact -package:gpolyline -package:numeric-prelude -package:ghc-boot -package:ghc-lib-parser -package:base -package:Cabal -package:monads-tf -package:ghc -package:polysemy package:ChasingBottoms

nonBottomError s raises an exception (AssertionFailed) that is not caught by isBottom. Use s to describe the exception.