make rustfmt mandatory and used pinned toolchain
Looks like this is what most people prefer/expect, and using a pinned toolchain for formatting avoids some (rare and so far mostly hypothetical) formatting inconsistency issues.
Format tests with rustfmt (288-299 of 299)
Extracted from #2097.
I'll make a separate PR to enable checking the `tests` directory's formatting in CI. I'll need to rebase that after both this and #2254 have landed, and if any new non-rustfmt-formatted files appear in the meantime, we can include formatting those in the same PR that enables the CI.
Format tests with rustfmt (225-275 of 300)
Extracted from #2097.
These cases all involve a line comment at the end of a block that rustfmt has chosen to wrap.
```diff
- unsafe { (*ptr).set(20); } //~ ERROR does not exist in the borrow stack
+ unsafe {
+ (*ptr).set(20);
+ } //~ ERROR does not exist in the borrow stack
```
I have moved all of those comments back onto the same line as the content of the block instead, as was indicated being `@RalfJung's` preference in https://github.com/rust-lang/miri/pull/2097#discussion_r862436672.
```diff
+ unsafe {
+ (*ptr).set(20); //~ ERROR does not exist in the borrow stack
+ }
```
Format tests with rustfmt (276-287 of 299)
Extracted from #2097.
This is one half of the last 24 files (left for last because they require more unique attention than the first 275 "easy" files).
I'll comment below to call attention to cases where I exercised my own judgement in how to format the test.
https://github.com/rust-lang/rustfmt/issues/3255 is especially annoying: rustfmt does not like `…( //` and `…{ //`.
Format tests with rustfmt (151-200 of 300)
Extracted from #2097.
This PR is still only doing the easy cases with no comments involved.
In the next PRs after this, I'll start grouping by common comment patterns, e.g. all the cases resembling https://github.com/rust-lang/miri/pull/2097#discussion_r862436672 together in one PR.
Format tests with rustfmt (51-100 of 300)
Extracted from #2097.
Like #2244, this is intended to be "easy" cases which don't involve comments in the vicinity.
