| // Test closure that: |
| // |
| // - takes an argument `y` with lifetime `'a` (in the code, it's anonymous) |
| // - stores `y` into another, longer-lived spot with lifetime `'b` |
| // |
| // Because `'a` and `'b` are two different, unrelated higher-ranked |
| // regions with no relationship to one another, this is an error. This |
| // error is reported by the closure itself and is not propagated to |
| // its creator: this is because `'a` and `'b` are higher-ranked |
| // (late-bound) regions and the closure is not allowed to propagate |
| // additional where clauses between higher-ranked regions, only those |
| // that appear free in its type (hence, we see it before the closure's |
| // "external requirements" report). |
| |
| // compile-flags:-Zborrowck=mir -Zverbose |
| |
| #![feature(rustc_attrs)] |
| |
| #[rustc_regions] |
| fn test() { |
| let x = 44; |
| let mut p = &x; |
| |
| { |
| let y = 22; |
| let mut closure = expect_sig(|p, y| *p = y); |
| //~^ ERROR |
| closure(&mut p, &y); |
| } |
| |
| deref(p); |
| } |
| |
| fn expect_sig<F>(f: F) -> F |
| where F: FnMut(&mut &i32, &i32) |
| { |
| f |
| } |
| |
| fn deref(_p: &i32) { } |
| |
| fn main() { } |