for x in range(a, b) -> for x in a..b

sed -i 's/in range(\([^,]*\), *\([^()]*\))/in \1\.\.\2/g' **/*.rs

src/librustdoc/html/toc.rs

@@ -154,7 +154,7 @@ impl TocBuilder {
             // fill in any missing zeros, e.g. for
             // # Foo (1)
             // ### Bar (1.0.1)
-            for _ in range(toc_level, level - 1) {
+            for _ in toc_level..level - 1 {
                 sec_number.push_str("0.");
             }
             let number = toc.count_entries_with_level(level);