Goal:
  
  x : V.t
  p : VSet.t
  H : VSet.In x p -> False
  a : V.t
  H0 : x = a -> False
  H1 : VSet.In a p
  ============================
   (x = a)


DEBUG:Going to execute:
<Coq.Init.Tauto.is_empty> flags X1; elim H
Level 4: Backtrace:

In environment
x : V.t
p : VSet.t
H : VSet.In x p -> False
a : V.t
H0 : x = a -> False
H1 : VSet.In a p
Unable to unify "a" with "x".
Level 4: Backtrace:

In environment
x : V.t
p : VSet.t
H : VSet.In x p -> False
a : V.t
H0 : x = a -> False
H1 : VSet.In a p
Unable to unify "a" with "x".
Level 5: Backtrace:

In environment
x : V.t
p : VSet.t
H : VSet.In x p -> False
a : V.t
H0 : x = a -> False
H1 : VSet.In a p
Unable to unify "a" with "x".
Level 5: Backtrace:

In environment
x : V.t
p : VSet.t
H : VSet.In x p -> False
a : V.t
H0 : x = a -> False
H1 : VSet.In a p
Unable to unify "a" with "x".
Level 4: Backtrace:

In environment
x : V.t
p : VSet.t
H : VSet.In x p -> False
a : V.t
H0 : x = a -> False
H1 : VSet.In a p
Unable to unify "a" with "x".
Level 4: Backtrace:

In environment
x : V.t
p : VSet.t
H : VSet.In x p -> False
a : V.t
H0 : x = a -> False
H1 : VSet.In a p
Unable to unify "a" with "x".