Determine if x consists out of tree_priors objects
See also
Use create_yule_tree_prior to create a Yule tree prior
Examples
check_empty_beautier_folder()
yule_tree_prior <- create_yule_tree_prior()
bd_tree_prior <- create_bd_tree_prior()
both_tree_priors <- list(yule_tree_prior, bd_tree_prior)
# TRUE
are_tree_priors(yule_tree_prior)
#> [1] TRUE
# TRUE
are_tree_priors(bd_tree_prior)
#> [1] TRUE
# TRUE
are_tree_priors(both_tree_priors)
#> [1] TRUE
check_empty_beautier_folder()