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fn a<'a, 'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) where 'b: 'a + 'c {
// Note: this is legal because of the `'b:'a` declaration.
*x = *y;
*z = *y;
}
fn b<'a, 'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) {
// Illegal now because there is no `'b:'a` declaration.
*x = *y;
*z = *y;
}
fn c<'a,'b, 'c>(x: &mut &'a isize, y: &mut &'b isize, z: &mut &'c isize) {
// Here we try to call `foo` but do not know that `'a` and `'b` are
// related as required.
a(x, y, z);
}
fn d() {
// 'a and 'b are early bound in the function `a` because they appear
// inconstraints:
let _: fn(&mut &isize, &mut &isize, &mut &isize) = a;
//~^ ERROR E0308
}
fn e() {
// 'a and 'b are late bound in the function `b` because there are
// no constraints:
let _: fn(&mut &isize, &mut &isize, &mut &isize) = b;
}
fn main() { }
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