mirror of https://github.com/rust-lang/rust
82 lines
1.2 KiB
Rust
82 lines
1.2 KiB
Rust
//@ run-pass
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#![allow(non_camel_case_types)]
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#![allow(dead_code)]
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use std::cell::Cell;
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// Resources can't be copied, but storing into data structures counts
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// as a move unless the stored thing is used afterwards.
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struct r<'a> {
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i: &'a Cell<isize>,
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}
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struct BoxR<'a> { x: r<'a> }
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impl<'a> Drop for r<'a> {
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fn drop(&mut self) {
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self.i.set(self.i.get() + 1)
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}
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}
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fn r(i: &Cell<isize>) -> r {
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r {
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i: i
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}
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}
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fn test_rec() {
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let i = &Cell::new(0);
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{
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let _a = BoxR {x: r(i)};
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}
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assert_eq!(i.get(), 1);
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}
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fn test_tag() {
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enum t<'a> {
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t0(r<'a>),
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}
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let i = &Cell::new(0);
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{
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let _a = t::t0(r(i));
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}
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assert_eq!(i.get(), 1);
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}
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fn test_tup() {
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let i = &Cell::new(0);
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{
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let _a = (r(i), 0);
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}
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assert_eq!(i.get(), 1);
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}
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fn test_unique() {
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let i = &Cell::new(0);
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{
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let _a: Box<_> = Box::new(r(i));
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}
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assert_eq!(i.get(), 1);
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}
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fn test_unique_rec() {
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let i = &Cell::new(0);
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{
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let _a: Box<_> = Box::new(BoxR {
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x: r(i)
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});
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}
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assert_eq!(i.get(), 1);
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}
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pub fn main() {
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test_rec();
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test_tag();
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test_tup();
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test_unique();
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test_unique_rec();
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}
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