File: variance-cell-is-invariant.rs

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rustc 1.88.0%2Bdfsg1-1
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// Test that Cell is considered invariant with respect to its
// type.

use std::cell::Cell;

struct Foo<'a> {
    x: Cell<Option<&'a isize>>,
}

fn use_<'short,'long>(c: Foo<'short>,
                      s: &'short isize,
                      l: &'long isize,
                      _where:Option<&'short &'long ()>) {
    let _: Foo<'long> = c;
    //~^ ERROR lifetime may not live long enough
}

fn main() {
}