Goal:
  
  ============================
   (false <-> false -> false = false)


DEBUG:Going to execute:
fun => <coq-core.plugins.ltac::reflexivity@0>

Goals:
  
  ============================
   (true <-> false -> true = false)

  
  ============================
   (false <-> true -> false = true)


DEBUG:Going to execute:
intros [H1 H2]

Goals:
    H1 : true -> false  H2 : false -> true
  ============================
   (true = false)

    H1 : false -> true  H2 : true -> false
  ============================
   (false = true)


DEBUG:Going to execute:
try specialize (H1 eq_refl)