For coverage tests, splitting code across multiple lines often makes the
resulting coverage report easier to interpret, so we force rustfmt to retain
line breaks by adding dummy line comments with `//`.

Currently we can't automatically enforce formatting on tests (see rust-lang#125637), but
we can at least keep things relatively tidy by occasionally running the
formatter manually.

This was done by temporarily commenting out the `"/tests/"` exclusion in
`rustfmt.toml`, and then running `x fmt tests/coverage` and
`x test coverage --bless`.

Format all source files in `tests/coverage/`

Currently we can't automatically enforce formatting on tests (see rust-lang#125637), but we can at least keep things relatively tidy by occasionally running the formatter manually.

This was done by temporarily commenting out the `"/tests/"` exclusion in `rustfmt.toml`, and then running:
- `x fmt tests/coverage`
- `x test coverage --bless`

(This PR also includes a few cosmetic tweaks to some of the affected files, to convince rustfmt to format them in the way we want.)

`@rustbot` label +A-code-coverage

…iaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#107099 (rustdoc: Add support for --remap-path-prefix)
 - rust-lang#125693 (Format all source files in `tests/coverage/`)
 - rust-lang#125700 (coverage: Avoid overflow when the MC/DC condition limit is exceeded)
 - rust-lang#125705 (Reintroduce name resolution check for trying to access locals from an inline const)
 - rust-lang#125708 (tier 3 target policy: clarify the point about producing assembly)
 - rust-lang#125715 (remove unneeded extern crate in rmake test)

r? `@ghost`
`@rustbot` modify labels: rollup

…iaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#124655 (Add `-Zfixed-x18`)
 - rust-lang#125693 (Format all source files in `tests/coverage/`)
 - rust-lang#125700 (coverage: Avoid overflow when the MC/DC condition limit is exceeded)
 - rust-lang#125705 (Reintroduce name resolution check for trying to access locals from an inline const)
 - rust-lang#125708 (tier 3 target policy: clarify the point about producing assembly)
 - rust-lang#125715 (remove unneeded extern crate in rmake test)
 - rust-lang#125719 (Extract coverage-specific code out of `compiletest::runtest`)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of rust-lang#125693 - Zalathar:format, r=lqd

Format all source files in `tests/coverage/`

Currently we can't automatically enforce formatting on tests (see rust-lang#125637), but we can at least keep things relatively tidy by occasionally running the formatter manually.

This was done by temporarily commenting out the `"/tests/"` exclusion in `rustfmt.toml`, and then running:
- `x fmt tests/coverage`
- `x test coverage --bless`

(This PR also includes a few cosmetic tweaks to some of the affected files, to convince rustfmt to format them in the way we want.)

``@rustbot`` label +A-code-coverage

There are no changes to `.rs` files because rust-lang#125693 recently formatted
them all.

There are no changes to `.rs` files because rust-lang#125693 recently formatted
them all.