`with` takes arg qualifiers

```fstar
fn foo (r : ref int)
requires pts_to r 2
ensures pts_to r 2
{
with #w. assert pts_to r w;
}
```
This probably should not be accepted since the hash on `w` is ignored.

Use the F* example in the issue as the starting case and inspect how `with` handles the `#w` argument qualifier. Determine where the ignored hash should be rejected, then verify that this example is no longer accepted without changing valid `with` usage.

Written by the indexing model from the issue text.