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// Test a case where we setup relationships like `'x: 'a` or `'a: 'x`,
// where `'x` is bound in closure type but `'a` is free. This forces
// us to approximate `'x` one way or the other.
// compile-flags:-Zverbose
#![feature(rustc_attrs)]
use std::cell::Cell;
fn foo<'a, F>(_cell: Cell<&'a u32>, _f: F)
where
F: for<'x> FnOnce(Cell<&'a u32>, Cell<&'x u32>),
{
}
#[rustc_regions]
fn case1() {
let a = 0;
let cell = Cell::new(&a);
foo(cell, |cell_a, cell_x| {
cell_a.set(cell_x.get()); // forces 'x: 'a, error in closure
//~^ ERROR
})
}
#[rustc_regions]
fn case2() {
let a = 0;
let cell = Cell::new(&a);
//~^ ERROR `a` does not live long enough
// As you can see in the stderr output, this closure propoagates a
// requirement that `'a: 'static'.
foo(cell, |cell_a, cell_x| {
cell_x.set(cell_a.get()); // forces 'a: 'x, implies 'a = 'static -> borrow error
})
}
fn main() { }
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