Ignore mix of {,non-}sugared doc in doc_markdown

clippy_lints/src/doc.rs

@@ -126,6 +126,11 @@ pub fn check_attrs<'a>(cx: &EarlyContext, valid_idents: &[String], attrs: &'a [a
                 spans.extend_from_slice(&current_spans);
                 doc.push_str(&current);
             }
+        } else if let Some(name) = attr.name() {
+            // ignore mix of sugared and non-sugared doc
+            if name == "doc" {
+                return;
+            }
         }
     }
 

clippy_tests/examples/doc.rs

@@ -144,3 +144,12 @@ fn four_quotes() {
 /// [NIST SP 800-56A, revision 2]:
 ///     https://github.com/Manishearth/rust-clippy/issues/902#issuecomment-261919419
 fn issue_902_comment() {}
+
+#[cfg_attr(feature = "a", doc = " ```")]
+#[cfg_attr(not(feature = "a"), doc = " ```ignore")]
+/// fn main() {
+///     let s = "localhost:10000".to_string();
+///     println!("{}", s);
+/// }
+/// ```
+fn issue_1469() {}