rust/tests/ui/closures/closure-referencing-itself-issue-25954.rs
2023-01-11 09:32:08 +00:00

19 lines
417 B
Rust

// Regression test for #25954: detect and reject a closure type that
// references itself.
use std::cell::{Cell, RefCell};
struct A<T: Fn()> {
x: RefCell<Option<T>>,
b: Cell<i32>,
}
fn main() {
let mut p = A{x: RefCell::new(None), b: Cell::new(4i32)};
// This is an error about types of infinite size:
let q = || p.b.set(5i32); //~ ERROR mismatched types
*(p.x.borrow_mut()) = Some(q);
}