Auto merge of #82994 - camelid:rename-source-to-span, r=jyn514

Rename `source` to `span` and `span` to `source`

- Rename `clean::Item.source` to `span`
- Rename `clean::Span::span()` to `clean::Span::inner()`
- Rename `rustdoc_json_types::Item.source` to `span`
- rustdoc-json: Rename `Import.span` to `Import.source`

*See also the [discussion on Zulip][z] (this is a bit more than discussed in
that conversation, but all the changes are related).*

r? `@jyn514`

[z]: https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/get.20span.20of.20file.20from.20name/near/229603729

src/librustdoc/html/render/context.rs

@@ -228,15 +228,15 @@ impl<'tcx> Context<'tcx> {
     /// may happen, for example, with externally inlined items where the source
     /// of their crate documentation isn't known.
     pub(super) fn src_href(&self, item: &clean::Item) -> Option<String> {
-        if item.source.is_dummy() {
+        if item.span.is_dummy() {
             return None;
         }
         let mut root = self.root_path();
         let mut path = String::new();
-        let cnum = item.source.cnum(self.sess());
+        let cnum = item.span.cnum(self.sess());
 
         // We can safely ignore synthetic `SourceFile`s.
-        let file = match item.source.filename(self.sess()) {
+        let file = match item.span.filename(self.sess()) {
             FileName::Real(ref path) => path.local_path().to_path_buf(),
             _ => return None,
         };
@@ -270,8 +270,8 @@ impl<'tcx> Context<'tcx> {
             (&*symbol, &path)
         };
 
-        let loline = item.source.lo(self.sess()).line;
-        let hiline = item.source.hi(self.sess()).line;
+        let loline = item.span.lo(self.sess()).line;
+        let hiline = item.span.hi(self.sess()).line;
         let lines =
             if loline == hiline { loline.to_string() } else { format!("{}-{}", loline, hiline) };
         Some(format!(

src/librustdoc/html/render/print_item.rs

@@ -937,7 +937,7 @@ fn item_macro(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, t: &clean::Mac
             Some("macro"),
             None,
             None,
-            it.source.span().edition(),
+            it.span.inner().edition(),
         );
     });
     document(w, cx, it, None)