rustdoc: Don't add extra newlines for fully opaque structs
Changes the definition for braced structs with only private or hidden fields to save space on the page.
Before:
```
pub struct Vec<T> {
// some fields omitted
}
```
After:
```
pub struct Vec<T> { /* fields omitted */ }
```
This also cleans up empty braced structs.
Before:
```
pub struct Foo {
}
```
After:
```
pub struct Foo {}
```
[before](https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html) [after](https://ollie27.github.io/rust_doc_test/std/vec/struct.Vec.html)
cc #34713
Changes the definition for opaque structs to look like `pub struct Vec<T>
{ /* fields omitted */ }` to save space on the page.
Also only use one line for empty braced structs.
rustdoc: Filter more incorrect methods inherited through Deref
Old code filtered out only static methods. This code also excludes &mut self methods if there is no DerefMut implementation.
Fixes#35169
rustdoc: Fix associated consts in search results
Associated consts can appear in none trait impls so need to be treated
like methods when generating the search index.
Fixes#36031
Most pages include the item type in the title such as "Struct
std::vec::Vec". However it is missing from the pages for foreign
functions, type definitions, macros, statics and constants. This adds them
so for example, instead of a title of "std::u32::MAX" it is "Constant
std::u32::MAX" to match the others.
rustdoc: remove the `!` from macro URLs and titles
Because the `!` is part of a macro use, not the macro's name. E.g., you write `macro_rules! foo` not `macro_rules! foo!`, also `#[macro_import(foo)]`.
(Pulled out of #35020).
rustdoc: Fix a couple of issues with the search results
* Fix links to static items in the search results.
* Don't include the path for primitive methods in the search results. Displaying `std::u32::max_value` is misleading so just display `u32::max_value`.
Added empty CloseDelim to tokens for future use.
Description says it all. I added a new DelimToken type, Empty, to indicate a Delimited tokenstream with no actual delimiters (which are variously useful for constructing macro output).
r? @nrc
Currently methods from extern crates are sometimes added to the search
index when they shouldn't be or added with the original path rather than
the reexported path. This fixes that by making sure `cache().paths` only
contains local paths like the description for it states. It also fixes a
few minor issues with link rendering and redirect generation which would
point to local crate docs even if the docs for that crate hadn't been
generated.
Also a bug with methods implemented on traits which caused wrong paths and
so dead links in the search results has been fixed.
rustdoc: Remove paths from primitive page <title> tags
Currently primitive pages have a title like "std::u8 - Rust" this changes
it to "u8 - Rust" as "std::u8" is the name of a module not a primitive
type.
