narrow down the lint trigger constraint

compiler/rustc_resolve/src/rustdoc.rs

@@ -1,4 +1,4 @@
-use pulldown_cmark::{BrokenLink, Event, LinkType, Options, Parser, Tag};
+use pulldown_cmark::{BrokenLink, CowStr, Event, LinkType, Options, Parser, Tag};
 use rustc_ast as ast;
 use rustc_ast::util::comments::beautify_doc_string;
 use rustc_data_structures::fx::FxHashMap;
@@ -436,15 +436,22 @@ fn parse_links<'md>(doc: &'md str) -> Vec<Box<str>> {
 fn collect_link_data<'input, 'callback>(
     event_iter: &mut Parser<'input, 'callback>,
 ) -> Option<Box<str>> {
-    let mut display_text = None;
+    let mut display_text: Option<String> = None;
+    let mut append_text = |text: CowStr<'_>| {
+        if let Some(display_text) = &mut display_text {
+            display_text.push_str(&text);
+        } else {
+            display_text = Some(text.to_string());
+        }
+    };
 
     while let Some(event) = event_iter.next() {
         match event {
-            Event::Text(code) => {
-                display_text = Some(code.to_string().into_boxed_str());
+            Event::Text(text) => {
+                append_text(text);
             }
             Event::Code(code) => {
-                display_text = Some(code.to_string().into_boxed_str());
+                append_text(code);
             }
             Event::End(_) => {
                 break;
@@ -453,5 +460,5 @@ fn collect_link_data<'input, 'callback>(
         }
     }
 
-    display_text
+    display_text.map(String::into_boxed_str)
 }

src/librustdoc/html/markdown.rs

@@ -1240,7 +1240,7 @@ pub(crate) fn plain_text_summary(md: &str, link_names: &[RenderedLink]) -> Strin
 pub(crate) struct MarkdownLink {
     pub kind: LinkType,
     pub link: String,
-    pub display_text: String,
+    pub display_text: Option<String>,
     pub range: MarkdownLinkRange,
 }
 
@@ -1402,13 +1402,23 @@ pub(crate) fn markdown_links<'md, R>(
                     LinkType::Autolink | LinkType::Email => unreachable!(),
                 };
 
-                let display_text =
-                    collect_link_data(&mut event_iter).map_or(String::new(), CowStr::into_string);
+                let display_text = if matches!(
+                    link_type,
+                    LinkType::Inline
+                        | LinkType::ReferenceUnknown
+                        | LinkType::Reference
+                        | LinkType::Shortcut
+                        | LinkType::ShortcutUnknown
+                ) {
+                    collect_link_data(&mut event_iter)
+                } else {
+                    None
+                };
 
                 if let Some(link) = preprocess_link(MarkdownLink {
                     kind: link_type,
-                    display_text,
                     link: dest.into_string(),
+                    display_text,
                     range,
                 }) {
                     links.push(link);
@@ -1424,16 +1434,23 @@ pub(crate) fn markdown_links<'md, R>(
 /// Collects additional data of link.
 fn collect_link_data<'input, 'callback>(
     event_iter: &mut OffsetIter<'input, 'callback>,
-) -> Option<CowStr<'input>> {
-    let mut display_text = None;
+) -> Option<String> {
+    let mut display_text: Option<String> = None;
+    let mut append_text = |text: CowStr<'_>| {
+        if let Some(display_text) = &mut display_text {
+            display_text.push_str(&text);
+        } else {
+            display_text = Some(text.to_string());
+        }
+    };
 
     while let Some((event, _span)) = event_iter.next() {
         match event {
-            Event::Text(code) => {
-                display_text = Some(code);
+            Event::Text(text) => {
+                append_text(text);
             }
             Event::Code(code) => {
-                display_text = Some(code);
+                append_text(code);
             }
             Event::End(_) => {
                 break;

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1041,18 +1041,20 @@ impl LinkCollector<'_, '_> {
             false,
         )?;
 
-        self.resolve_display_text(
-            path_str,
-            ResolutionInfo {
-                item_id,
-                module_id,
-                dis: disambiguator,
-                path_str: ori_link.display_text.clone().into_boxed_str(),
-                extra_fragment: extra_fragment.clone(),
-            },
-            &ori_link,
-            &diag_info,
-        );
+        if ori_link.display_text.is_some() {
+            self.resolve_display_text(
+                path_str,
+                ResolutionInfo {
+                    item_id,
+                    module_id,
+                    dis: disambiguator,
+                    path_str: ori_link.display_text.clone()?.into_boxed_str(),
+                    extra_fragment: extra_fragment.clone(),
+                },
+                &ori_link,
+                &diag_info,
+            );
+        }
 
         // Check for a primitive which might conflict with a module
         // Report the ambiguity and require that the user specify which one they meant.
@@ -1429,7 +1431,7 @@ impl LinkCollector<'_, '_> {
         //
         // Notice that this algorithm is passive, might possibly miss actual redudant cases.
         let explicit_link = &explicit_link.to_string();
-        let display_text = &ori_link.display_text;
+        let display_text = ori_link.display_text.as_ref().unwrap();
         let display_len = display_text.len();
         let explicit_len = explicit_link.len();
 

src/librustdoc/passes/lint/redundant_explicit_links.rs

@@ -67,6 +67,16 @@ fn check_redundant_explicit_link<'md>(
             Event::Start(Tag::Link(link_type, dest, _)) => {
                 let link_data = collect_link_data(&mut offset_iter);
 
+                if let Some(resolvable_link) = link_data.resolvable_link.as_ref() {
+                    if &link_data.display_link != resolvable_link {
+                        // Skips if display link does not match to actual
+                        // resolvable link, usually happens if display link
+                        // has several segments, e.g.
+                        // [this is just an `Option`](Option)
+                        continue;
+                    }
+                }
+
                 let explicit_link = dest.to_string();
                 let display_link = link_data.resolvable_link.clone()?;
                 let explicit_len = explicit_link.len();

tests/rustdoc-ui/lints/no-redundancy.rs

@@ -3,4 +3,5 @@
 #![deny(rustdoc::redundant_explicit_links)]
 
 /// [Vec][std::vec::Vec#examples] should not warn, because it's not actually redundant!
+/// [This is just an `Option`][std::option::Option] has different display content to actual link!
 pub fn func() {}