def decl_consts(menv: msat_env, name: str, c_type):
    assert (not name.startswith('_')), name
    s = msat_declare_function(menv, name, c_type)
    s = msat_make_constant(menv, s)
    x_s = msat_declare_function(menv, name_next(name), c_type)
    x_s = msat_make_constant(menv, x_s)
    return (s, x_s)
def decl_consts(menv: msat_env, name: str, c_type):
    assert (not name.startswith('_')), name
    s = msat_declare_function(menv, name, c_type)
    s = msat_make_constant(menv, s)
    x_s = msat_declare_function(menv, name_next(name), c_type)
    x_s = msat_make_constant(menv, x_s)
    return (s, x_s)