rustdoc: #[doc(inline)] does not work on cross-crate glob re-exports

[QuietMisdreavus]

cf. This is the std::alloc docs page:

...but this is how those items are declared:

As i understand it, #[doc(inline)] properly applies to local glob re-exports, but apparently not for cross-crate ones. This is not being handled correctly.

[QuietMisdreavus]

Here's the offending code:

rust/src/librustdoc/clean/mod.rs

Lines 3734 to 3745 in 5342d40

	let inner = if self.glob {
	Import::Glob(resolve_use_source(cx, path))
	} else {
	let name = self.name;
	if !denied {
	let mut visited = FxHashSet();
	if let Some(items) = inline::try_inline(cx, path.def, name, &mut visited) {
	return items;
	}
	}
	Import::Simple(name.clean(cx), resolve_use_source(cx, path))
	};

When cleaning an import statement, rustdoc will only load an item if the import is not a glob import. If it is a glob import, it instead registers the underlying path (which i believe is the module/enum path) and leaves the import statement alone. It would instead be prudent to check the import statement for #[doc(inline)] (done already and saved in denied), check whether the glob import is based in a module, scan that module for its items, then import all those items, just like what it does for single-item imports.