diff --git a/src/extract_doc.rs b/src/extract_doc.rs
index 5b75c47..d92ceac 100644
--- a/src/extract_doc.rs
+++ b/src/extract_doc.rs
@@ -55,13 +55,13 @@ pub fn extract_doc_from_source_str(source: &str) -> Result<Option<Doc>, ExtractD
                             str.chars().all(char::is_whitespace)
                         }
 
-                        let x = string
+                        let comment_lines = string
                             .lines()
                             .enumerate()
                             .filter(|(i, l)| !(*i == 0 && empty_line(l)))
-                            .map(|(_, l)| l);
+                            .map(|(_, l)| l.to_owned());
 
-                        lines.extend(x.map(ToOwned::to_owned));
+                        lines.extend(comment_lines);
                     }
                 }
             }
diff --git a/tools/codecov.sh b/tools/codecov.sh
index 615cd55..f9586ab 100755
--- a/tools/codecov.sh
+++ b/tools/codecov.sh
@@ -36,7 +36,7 @@ done
 
 # TODO it seems the `--force-clean` is not working.
 cargo clean
-cargo tarpaulin --force-clean --ignore-panics --engine llvm --timeout 1200 --out $output_format
+cargo tarpaulin --force-clean --ignore-panics --engine llvm --timeout 1200 --out $output_format --all-features
 
 if [ "$output_format" == "html" ]; then
     echo