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


DEBUG:Going to execute:
unfold Tactics.fix_proto in *
Level 1: Backtrace:

No matching clauses for match.
Level 0: Backtrace:

No matching clauses for match.