local env = environment()
env = env:begin_section_scope()
env = env:add_global_level("l")
local l  = mk_global_univ("l")
local l1 = mk_param_univ("l")
env = add_decl(env, mk_definition("A", {l1}, mk_sort(max_univ(l, l1)+1), mk_sort(max_univ(l, l1))))
env = env:end_scope()
print (env:find("A"):type())
local ls = env:find("A"):univ_params()
assert(#ls == 2)
print(ls:head())
assert(ls:head() == name("l"))
assert(ls:tail():head() == name("l_1"))