:: String -> Int is:exact -package:string-conversions -package:speculate -package:hxt -package:ViennaRNAParser -package:Cabal package:polysemy

The error used in fixpointToFinal, runFixpoint and runFixpointM when the result of a failed computation is recursively used and somehow visible. You may use this for your own Fixpoint interpreters. The argument should be the name of the interpreter.