fix: tie rust export borrows to analysis lifetime

[cijiugechu]

Resolves #16 .

Currently compiler can check UAF correctly :

Checking merve v1.1.0 (/home/baka/repos/merve/rust)
error[E0597]: `analysis` does not live long enough
 --> examples/unsound_check.rs:7:9
  |
5 |     let leaked: &str = {
  |         ------ borrow later stored here
6 |         let analysis = parse_commonjs(&src).unwrap();
  |             -------- binding `analysis` declared here
7 |         analysis.export_name(0).unwrap()
  |         ^^^^^^^^ borrowed value does not live long enough
8 |     };
  |     - `analysis` dropped here while still borrowed
For more information about this error, try `rustc --explain E0597`.
error: could not compile `merve` (example "unsound_check") due to 1 previous error

[anonrig]

Can you add a test that verifies this?

[cijiugechu]

Can you add a test that verifies this?

Added in #19 .