dead-code lint: say "constructed" for structs
Respectively.
This is a sequel to November 2017's #46103 / 1a9dc2e9. It had been
reported (more than once—at least #19140, #44083, and #44565) that the
"never used" language was confusing for enum variants that were "used"
as match patterns, so the wording was changed to say never "constructed"
specifically for enum variants. More recently, the same issue was raised
for structs (#52325). It seems consistent to say "constructed" here,
too, for the same reasons.
~~While we're here, we can also use more specific word "called" for unused
functions and methods. (We declined to do this in #46103, but the
rationale given in the commit message doesn't actually make sense.)~~
This resolves#52325.
make `everybody_loops` preserve item declarations
First half of https://github.com/rust-lang/rust/issues/52545.
`everybody_loops` is used by rustdoc to ensure we don't contain erroneous references to platform APIs if one of its uses is pulled in by `#[doc(cfg)]`. However, you can also implement traits for public types inside of functions. This is used by Diesel (probably others, but they were the example that was reported) to get around a recent macro hygiene fix, which has caused their crate to fail to document. While this won't make the traits show up in documentation (that step comes later), it will at least allow files to be generated.
rustdoc: refactor how passes are structured, and turn intra-doc-link collection into a pass
This builds on https://github.com/rust-lang/rust/pull/52751 and should not be merged until that finally finishes the bors queue
Part 2 of my passes refactor. This introduces the concept of an "early pass", which is run right before exiting the compiler context. This is important for passes that may want to ask the compiler about things. For example, i took out the intra-doc-link collection and turned it into a early pass. I also made the `strip-hidden`, `strip-private` and `strip-priv-imports` passes occur as early passes, so that intra-doc-link collection wouldn't run on docs that weren't getting printed.
Fixes https://github.com/rust-lang/rust/issues/51684, technically https://github.com/rust-lang/rust/issues/51468 too but that version of `h2` hits a legit intra-link error after that `>_>`
r? @rust-lang/rustdoc
