lifetime-generate issue: named lifetime param on closure

[Travis Hance]

Reported by Yi Cai:

use vstd::prelude::*;

verus! {

pub struct S<'a> {
    pub data: &'a u8,
}

type Res<'a, T> = Result<(S<'a>, T), Err>;

pub enum Err {
    A,
}

fn not_ok<'a>(s: S<'a>) -> Res<'a, u8> {
    let cls = |s: S<'a>| -> Res<'a, u8> { ok(s) };
    Ok((s, 0))
}

fn ok<'a>(s: S<'a>) -> Res<'a, u8> {
    Ok((s, 0))
}

fn main();

}

error: lifetime may not live long enough
  --> /playground/src/main.rs:16:16
   |
16 |     let cls = |s: S<'a>| -> Res<'a, u8> { ok(s) };
   |                ^              ^           ^^^^^

error: aborting due to previous error

note: This error was found in Verus pass: ownership checking of tracked code

error: aborting due to 2 previous errors