index(n, stepsFrom: i)

M-x findr-query-replace

\<advance(\([^:]+?\),\([
]+\)by: *\([^(),]*\|[^(),]+([^()]*)[^(),]*\)\(,\(?:[
]+\)limit: *\(?:[^()]*\|[^()]+([^()]*)[^()]*\)\)?)

index(\3,\2stepsFrom: \1\4)

stdlib/public/core/CollectionAlgorithms.swift.gyb

@@ -154,7 +154,7 @@ ${orderingRequirementForComparable}
       return unsafeBufferPivot - bufferPointer.startIndex
     }
     if let offset = maybeOffset {
-      return advance(startIndex, by: numericCast(offset))
+      return index(numericCast(offset), stepsFrom: startIndex)
     }
 
 %   if preds: