Goal:
    x : t  y : t  Heq_anonymous : false = eqb x y  H : x = y
  ============================
   False


DEBUG:Going to execute:
match H with
           | H' => fail 2
           | _ => unify X Y; clear H' || clear H
           end
Level 4: Backtrace:

In environment
x, y : t
Heq_anonymous : false = eqb x y
H : x = y
Unable to unify "t" with "x = y".
Level 4: Backtrace:

In environment
x, y : t
Heq_anonymous : false = eqb x y
H : x = y
Unable to unify "t" with "x = y".
Level 4: Backtrace:

In environment
x, y : t
Heq_anonymous : false = eqb x y
H : x = y
Unable to unify "t" with "x = y".
Level 4: Backtrace:

In environment
x, y : t
Heq_anonymous : false = eqb x y
H : x = y
Unable to unify "t" with "x = y".
Level 3: Backtrace:

In environment
x, y : t
Heq_anonymous : false = eqb x y
H : x = y
Unable to unify "t" with "x = y".