Rollup merge of #42490 - gaurikholkar:master, r=eddyb

Changing error message from `contains interior mutability` to `may contain interior mutability`

Fixes #40313 . I have changed the message from `contains interior mutability` to `may contain interior mutability` for the following example
```
use std::cell::Cell;
use std::panic::catch_unwind;
fn main() {
    let mut x = Cell::new(22);
    catch_unwind(|| { x.set(23); });
}
```
which has been added as a ui test.

Also, the message [here](https://github.com/gaurikholkar/rust/blob/master/src/librustc_mir/transform/qualify_consts.rs#L666) and it's respective `compile-fail` test have been modified.

cc @nikomatsakis  @Mark-Simulacrum  @eddyb

0 files changed, 0 insertions, 0 deletions