Rollup merge of #108129 - GuillaumeGomez:correctly-handle-links-starting-with-whitespace, r=petrochenkov

Correctly handle links starting with whitespace

Part of https://github.com/rust-lang/rust/issues/107995.

I just got this issue, wrote a fix and then saw the issue. So here's the PR. ^^'

r? `@petrochenkov`

compiler/rustc_resolve/src/rustdoc.rs

@@ -339,6 +339,7 @@ pub fn inner_docs(attrs: &[ast::Attribute]) -> bool {
 fn preprocess_link(link: &str) -> String {
     let link = link.replace('`', "");
     let link = link.split('#').next().unwrap();
+    let link = link.trim();
     let link = link.rsplit('@').next().unwrap();
     let link = link.strip_suffix("()").unwrap_or(link);
     let link = link.strip_suffix("{}").unwrap_or(link);

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -884,7 +884,8 @@ fn preprocess_link(
     let mut parts = stripped.split('#');
 
     let link = parts.next().unwrap();
-    if link.trim().is_empty() {
+    let link = link.trim();
+    if link.is_empty() {
         // This is an anchor to an element of the current page, nothing to do in here!
         return None;
     }
@@ -897,7 +898,7 @@ fn preprocess_link(
     // Parse and strip the disambiguator from the link, if present.
     let (disambiguator, path_str, link_text) = match Disambiguator::from_str(link) {
         Ok(Some((d, path, link_text))) => (Some(d), path.trim(), link_text.trim()),
-        Ok(None) => (None, link.trim(), link.trim()),
+        Ok(None) => (None, link, link),
         Err((err_msg, relative_range)) => {
             // Only report error if we would not have ignored this link. See issue #83859.
             if !should_ignore_link_with_disambiguators(link) {

tests/rustdoc/issue-107995.rs

@@ -0,0 +1,28 @@
+// Regression test for <https://github.com/rust-lang/rust/issues/107995>.
+
+#![crate_name = "foo"]
+
+// @has 'foo/fn.foo.html'
+// @has - '//*[@class="docblock"]//a[@href="fn.bar.html"]' 'bar`'
+/// A foo, see also [ bar`]
+pub fn foo() {}
+
+// @has 'foo/fn.bar.html'
+// @has - '//*[@class="docblock"]' 'line Path line'
+// @has - '//*[@class="docblock"]//a[@href="struct.Path.html"]' 'Path'
+#[doc = "line ["]
+#[doc = "Path"]
+#[doc = "] line"]
+pub fn bar() {}
+
+// @has 'foo/fn.another.html'
+// @has - '//*[@class="docblock"]//a[@href="struct.Path.html"]' 'Path'
+/// [ `Path`]
+pub fn another() {}
+
+// @has 'foo/fn.last.html'
+// @has - '//*[@class="docblock"]//a[@href="struct.Path.html"]' 'Path'
+/// [ Path`]
+pub fn last() {}
+
+pub struct Path;