| // Test closure that: |
| // |
| // - takes an argument `y` |
| // - stores `y` into another, longer-lived spot |
| // |
| // but is invoked with a spot that doesn't live long |
| // enough to store `y`. |
| // |
| // The error is reported in the caller: invoking the closure links the |
| // lifetime of the variable that is given as `y` (via subtyping) and |
| // thus forces the corresponding borrow to live too long. This is |
| // basically checking that the MIR type checker correctly enforces the |
| // closure signature. |
| |
| //@ compile-flags:-Zverbose-internals |
| |
| #![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); |
| closure(&mut p, &y); |
| //~^ ERROR `y` does not live long enough [E0597] |
| } |
| |
| deref(p); |
| } |
| |
| fn expect_sig<F>(f: F) -> F |
| where F: for<'a, 'b> FnMut(&'a mut &'b i32, &'b i32) |
| { |
| f |
| } |
| |
| fn deref(_p: &i32) { } |
| |
| fn main() { } |
