error[E0597]: `buffer` does not live long enough
   --> src/main.rs:63:21
      |
   59 |     let report = {
      |         ------ borrow later stored here
   60 |         let mut buffer = Vec::new();
      |             ---------- binding `buffer` declared here
   61 |         let ctx = Context {
   62 |             config: &config,
      |             ------ this field and `buffer` are required by `Context` to have the same lifetime
   63 |             buffer: &mut buffer,
      |                     ^^^^^^^^^^^ borrowed value does not live long enough
   ...
   68 |     };
      |     - `buffer` dropped here while still borrowed
   help: consider making different fields in `Context` have independent lifetimes
     |
   4 | struct Context<'a> {
     |                ^^
   5 |     config: &'a Config,
     |              ^^
   6 |     buffer: &'a mut Vec<u8>,
     |              ^^
   7 | }