diff --git a/src/test/compile-fail/closure-referencing-itself-issue-25954.rs b/src/test/compile-fail/closure-referencing-itself-issue-25954.rs new file mode 100644 index 00000000000..9357d0e7615 --- /dev/null +++ b/src/test/compile-fail/closure-referencing-itself-issue-25954.rs @@ -0,0 +1,28 @@ +// Copyright 2012 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +// Regression test for #25954: detect and reject a closure type that +// references itself. + +use std::cell::{Cell, RefCell}; + +struct A { + x: RefCell>, + b: Cell, +} + +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); +}