Goal:
    A : Type  l : list A  hd : A  tl : list A
  ============================
   (tl = tl)


DEBUG:Going to execute:
<coq-core.plugins.ltac::trivial@0> $1 $2

Goals:

DEBUG:Going to execute:
repeat (do_intro; try do_atom)

Goals:

DEBUG:Going to execute:
try arith_congr

Goals:

DEBUG:Going to execute:
solve [ split; do_ccl ]