Goal:
    A : Type  y : A  a : A  H2 : [] = [] ++ [y]
  ============================
   ([] = [a] ∧ a = y)


DEBUG:Going to execute:
inversion H

Goals:

DEBUG:Going to execute:
subst

Goals:

DEBUG:Going to execute:
<coq-core.plugins.ltac::subst@1>

Goals:

DEBUG:Going to execute:
clear H