Add a test to make that the failure condition for this pattern is
optimized away.

Fixes rust-lang#98294.

It was added with e08a84a
(actually, it was called `.methods > .stability` at the time) and was
directly nested that way.

But with the switch to `<details>`, the code has changed drastically out from
under it, to the point where you have to go out of your way to actually get
it to render this way, and the result looks overly-tight and weird alongside
the normal version where this code is not reachable.

In the future,`ffx component run` will not default to the using the `/core/ffx-laboratory` collection. Updated the run commands to include this.

Add test for rust-lang#98294

Add a test to make that the failure condition for this pattern is optimized away.

Fixes rust-lang#98294.

…ity, r=notriddle

rustdoc: remove old CSS selector that causes weird spacing

It was added with e08a84a (actually, it was called `.methods > .stability` at the time) and was directly nested that way.

**EDIT**: It is technically reachable code still, but it seems wrong.

## With the old CSS rule still present

https://notriddle.com/notriddle-rustdoc-test/weird-spacing/lib/struct.Foo.html

![image](https://user-images.githubusercontent.com/1593513/188216226-c667c560-d33d-494f-a492-4e0ec3ac0009.png)

## Version 2 (an older version of this PR)

https://notriddle.com/notriddle-rustdoc-test/normal-spacing-2/lib/struct.Foo.html

![image](https://user-images.githubusercontent.com/1593513/188216418-9fcd3109-f1b2-425d-b4fc-0c6b3b54e48e.png)

## Version 3 (with alignment fix for mobile)

https://notriddle.com/notriddle-rustdoc-test/normal-spacing-3/lib/struct.Foo.html

![image](https://user-images.githubusercontent.com/1593513/188223161-0e1ebce7-842f-41cb-8a0c-ae43aedcfccc.png)

ffx component run should provide a collection

In the future,`ffx component run` will not default to the using the `/core/ffx-laboratory` collection. Updated the run commands to include this.

…ns, r=wesleywiser

Shrink suggestion span of argument mismatch error

This doesn't really help with rust-lang#101242, but I wanted to put this up while I work on other fixes.

remove redundant clones