rustup
This test was removed in rustc in https://github.com/rust-lang/rust/pull/87141.
We added it in https://github.com/rust-lang/miri/pull/1430, and possibly that "interesting case in unsizing" is not covered by tests now -- but I don't remember what that case is.^^ If/when `impl Trait` in bindings comes back, we should copy the new rustc tests to Miri as well.
fmt: set force_multiline_blocks=true
This is an experiment, I am not yet sure if I like it... but it does prevent rustfmt from putting stuff after the `=>` in a `match` (unless the entire arm fits there), which IMO is a big plus. What do others think?
(I also tried setting `match_arm_blocks` back to its default of `true`, but that adds too many braces for my taste.)
Btw, `@calebcartwright` is the interaction of `match_arm_blocks = false` and `force_multiline_blocks = true` as can be seen here expected? I think I like it, but it it is not at all what I expected from the docs which describe `force_multiline_blocks = true` as "Force multiline closure and match arm bodies to be wrapped in a block" -- but here that is not the effect it has, there are no new blocks being added.
sync license files with rustc repo
`@Mark-Simulacrum` pointed out that our license files are slightly different from those in rustc. This syncs them.
The question is... is this a thing we can just do?^^
Use `miri` inside the target directory used by rustc as Miri's target directory
Resolves#1311.
This PR makes Miri use `miri` inside the rustc target directory as its target directory, by letting `cargo-miri` get the rustc target directory by calling `cargo metadata`, append `miri` to it, and pass it with `--target-dir` to Cargo.
Getting the rustc target directory accurately requires calling `cargo metadata` as far as I know, because the `target-dir` can be set in config files in various places that are hard for `cargo-miri` to find.
I also considered https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#custom-named-profiles, but it looks like that requires adding `cargo-features = ["named-profiles"]` to **`Cargo.toml`**, which would be tricky for `cargo-miri`:
```
$ cargo +nightly-2021-06-23 test --config 'profile.miri.inherits="release"' --profile=miri -Z named-profiles -Z unstable-options
error: config profile `miri` is not valid (defined in `--config cli option`)
Caused by:
feature `named-profiles` is required
consider adding `cargo-features = ["named-profiles"]` to the manifest
```
