fn test_isnil_byteptr() {
pb := &u8(0)
assert isnil(pb)
}
fn test_isnil_voidptr() {
pv := voidptr(0)
assert isnil(pv)
fn test_isnil_charptr() {
pc := &char(0)
assert isnil(pc)
fn test_isnil_intptr() {
pi := &int(0)
assert isnil(pi)