MuOnlyPosNotSPos.err

MiniAgda by Andreas Abel and Karl Mehltretter
--- opening "MuOnlyPosNotSPos.ma" ---
--- scope checking ---
--- type checking ---
type  Mu : ++(F : + Set -> Set) -> Set
error during typechecking:
Mu
/// constructor Mu.inn
/// new Mu : (++(F : (+Set -> Set)::Set) -> Set)
/// new F : (+Set -> {Set {Mu = (v0 Up (++(F : (+Set -> Set)::Set) -> Set))}})
/// inferExpr' ^ F (Mu F) -> Mu F
/// inferExpr' F (Mu F)
/// checkApp (+Set -> {Set {Mu = (v0 Up (++(F : (+Set -> Set)::Set) -> Set))}}) eliminated by Mu F
/// inferExpr' Mu F
/// checkApp (++(F : (+Set -> Set)::Set) -> Set) eliminated by F
/// inferExpr' F
/// inferExpr: variable F : + Set -> Set may not occur
/// , because of polarity
/// polarity check ++ <= + failed