rustdoc js: add rustdoc.ScrapedLoc type

Author: lolbinarycat

src/librustdoc/html/static/js/rustdoc.d.ts

@@ -496,6 +496,8 @@ declare namespace rustdoc {
      * Single element in the data-locs field of a scraped example.
      * First field is the start and end char index,
      * other fields seem to be unused.
+     *
+     * generated by `render_call_locations` in `render/mod.rs`.
      */
     type ScrapedLoc = [[number, number], string, string]
 }

src/librustdoc/html/static/js/scrape-examples.js

@@ -127,7 +127,9 @@
      * @param {boolean} isHidden
      */
     function setupLoc(example, isHidden) {
-        const locs = example.locs = JSON.parse(nonnull(nonnull(example.attributes.getNamedItem("data-locs")).textContent));
+        const locs_str = example.attributes.getNamedItem("data-locs")).textContent;
+        const locs = example.locs =
+              JSON.parse(nonnull(nonnull(locs_str));
         // Start with the first example in view
         scrollToLoc(example, locs[0][0], isHidden);
     }