Find name uses within classes

src/analysis/slice/data-flow.ts

@@ -337,6 +337,11 @@ export class DataflowAnalyzer {
         uses = undefinedRefs.filter(r => r.level == ReferenceType.USE);
         break;
       case ast.CLASS:
+        // For each class function, call getUses
+        const usesArr = statement.code
+          .flatMap(classStatement => this.getUses(classStatement, _));
+        // Don't reduce an empty array
+        uses = usesArr.length > 0 ? usesArr.reduce((prev, curr) => prev.union(curr)) : uses;
         break;
       default: {
         const usedNames = gatherNames(statement);