mirror of https://github.com/rust-lang/rust
55 lines
1.0 KiB
Rust
55 lines
1.0 KiB
Rust
//@ run-pass
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#![allow(dead_code)]
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#![allow(non_camel_case_types)]
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//@ pretty-expanded FIXME #23616
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#![feature(allocator_api)]
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use std::alloc::{handle_alloc_error, Allocator, Global, Layout};
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use std::ptr::NonNull;
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struct arena(());
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struct Bcx<'a> {
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fcx: &'a Fcx<'a>,
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}
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struct Fcx<'a> {
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arena: &'a arena,
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ccx: &'a Ccx,
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}
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struct Ccx {
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x: isize,
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}
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fn allocate(_bcx: &arena) -> &mut Bcx<'_> {
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unsafe {
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let layout = Layout::new::<Bcx>();
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let ptr = Global.allocate(layout).unwrap_or_else(|_| handle_alloc_error(layout));
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&mut *ptr.as_ptr().cast()
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}
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}
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fn h<'a>(bcx: &'a Bcx<'a>) -> &'a mut Bcx<'a> {
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return allocate(bcx.fcx.arena);
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}
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fn g(fcx: &Fcx) {
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let bcx = Bcx { fcx };
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let bcx2 = h(&bcx);
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unsafe {
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Global.deallocate(NonNull::new_unchecked(bcx2 as *mut _ as *mut _), Layout::new::<Bcx>());
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}
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}
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fn f(ccx: &Ccx) {
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let a = arena(());
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let fcx = Fcx { arena: &a, ccx };
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return g(&fcx);
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}
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pub fn main() {
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let ccx = Ccx { x: 0 };
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f(&ccx);
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}
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