Goal:
  
  A : Type
  P : A -> Type
  p : A -> bool
  Hp : forall x : A, reflectT (P x) (p x)
  ============================
   (reflectT unit true)


DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>
Level 0: Backtrace:

No matching clauses for match.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.
Level 1: Backtrace:

No applicable tactic.
Level 0: Backtrace:

No applicable tactic.