Goal:
    A : Type  E : EqDec A  x : A  y : A
  ============================
   (reflectProp (x = y) (eq_dec_to_bool x y))


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

In environment
A : Type
E : EqDec A
x, y : A
Unable to unify "EqDec A" with "A".
Level 4: Backtrace:

In environment
A : Type
E : EqDec A
x, y : A
Unable to unify "EqDec A" with "A".
Level 4: Backtrace:

In environment
A : Type
E : EqDec A
x, y : A
Unable to unify "EqDec A" with "A".
Level 4: Backtrace:

In environment
A : Type
E : EqDec A
x, y : A
Unable to unify "EqDec A" with "A".
Level 3: Backtrace:

In environment
A : Type
E : EqDec A
x, y : A
Unable to unify "EqDec A" with "A".