Fix multiline attributes processing in doctest

src/librustdoc/doctest.rs

@@ -795,7 +795,9 @@ fn partition_source(s: &str, edition: Edition) -> (String, String, String) {
                         // If not, then we append the new line into the pending attribute to check
                         // if this time it's complete...
                         mod_attr_pending.push_str(line);
-                        if !trimline.is_empty() && check_if_attr_is_complete(line, edition) {
+                        if !trimline.is_empty()
+                            && check_if_attr_is_complete(&mod_attr_pending, edition)
+                        {
                             // If it's complete, then we can clear the pending content.
                             mod_attr_pending.clear();
                         }

src/test/rustdoc-ui/doc-comment-multi-line-attr.rs

@@ -0,0 +1,11 @@
+// Regression test for #97440: Multiline inner attribute triggers ICE during doctest
+// compile-flags:--test
+// normalize-stdout-test: "src/test/rustdoc-ui" -> "$$DIR"
+// normalize-stdout-test "finished in \d+\.\d+s" -> "finished in $$TIME"
+// check-pass
+
+//! ```rust
+//! #![deny(
+//! unused_parens,
+//! )]
+//! ```

src/test/rustdoc-ui/doc-comment-multi-line-attr.stdout

@@ -0,0 +1,6 @@
+
+running 1 test
+test $DIR/doc-comment-multi-line-attr.rs - (line 7) ... ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+