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// run-pass
// needs-unwind
#![allow(dropping_references, dropping_copy_types)]
static mut CHECK: usize = 0;
struct DropChecker(usize);
impl Drop for DropChecker {
fn drop(&mut self) {
unsafe {
if CHECK != self.0 - 1 {
panic!("Found {}, should have found {}", CHECK, self.0 - 1);
}
CHECK = self.0;
}
}
}
macro_rules! check_drops {
($l:literal) => {
unsafe { assert_eq!(CHECK, $l) }
};
}
struct DropPanic;
impl Drop for DropPanic {
fn drop(&mut self) {
panic!()
}
}
fn value_zero() {
unsafe { CHECK = 0 };
let foo = DropChecker(1);
let v: [DropChecker; 0] = [foo; 0];
check_drops!(1);
std::mem::drop(v);
check_drops!(1);
}
fn value_one() {
unsafe { CHECK = 0 };
let foo = DropChecker(1);
let v: [DropChecker; 1] = [foo; 1];
check_drops!(0);
std::mem::drop(v);
check_drops!(1);
}
const DROP_CHECKER: DropChecker = DropChecker(1);
fn const_zero() {
unsafe { CHECK = 0 };
let v: [DropChecker; 0] = [DROP_CHECKER; 0];
check_drops!(0);
std::mem::drop(v);
check_drops!(0);
}
fn const_one() {
unsafe { CHECK = 0 };
let v: [DropChecker; 1] = [DROP_CHECKER; 1];
check_drops!(0);
std::mem::drop(v);
check_drops!(1);
}
fn const_generic_zero<const N: usize>() {
unsafe { CHECK = 0 };
let v: [DropChecker; N] = [DROP_CHECKER; N];
check_drops!(0);
std::mem::drop(v);
check_drops!(0);
}
fn const_generic_one<const N: usize>() {
unsafe { CHECK = 0 };
let v: [DropChecker; N] = [DROP_CHECKER; N];
check_drops!(0);
std::mem::drop(v);
check_drops!(1);
}
// Make sure that things are allowed to promote as expected
fn allow_promote() {
unsafe { CHECK = 0 };
let foo = DropChecker(1);
let v: &'static [DropChecker; 0] = &[foo; 0];
check_drops!(1);
std::mem::drop(v);
check_drops!(1);
}
// Verify that unwinding in the drop causes the right things to drop in the right order
fn on_unwind() {
unsafe { CHECK = 0 };
std::panic::catch_unwind(|| {
let panic = DropPanic;
let _local = DropChecker(2);
let _v = (DropChecker(1), [panic; 0]);
std::process::abort();
})
.unwrap_err();
check_drops!(2);
}
fn main() {
value_zero();
value_one();
const_zero();
const_one();
const_generic_zero::<0>();
const_generic_one::<1>();
allow_promote();
on_unwind();
}
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