Goal:
    x : t  X : lt x x
  ============================
   (let H := CoreTactics.block in let H0 := CoreTactics.block in False)


DEBUG:Going to execute:
progress (autounfold with equations in e; simpl in e)
Level 1: evaluation returns
repeat progress (autounfold with equations in e; simpl in e)
where
e := X
of type
constr of type tacvalue