Always insert 'return this;' at the end of constructors.

            // Insert call to super() if it is implicit.

            if (!ASTUtils.constructorHasExplicitConstructorInvocation(n)){

                var superCall = new ExplicitConstructorInvocationStmt(null, null, false, null, new NodeList<>());

                var returnThis = new ReturnStmt(new ThisExpr());

                methodInsertedInstructions.add(superCall);

                methodInsertedInstructions.add(returnThis);

                n.getBody().addStatement(0, superCall);

                n.getBody().addStatement(returnThis);

            }

            // insert return this;

            var returnThis = new ReturnStmt(new ThisExpr());

            methodInsertedInstructions.add(returnThis);

            n.getBody().addStatement(returnThis);

            // Perform the same task as previous graphs.

            super.visit(n, arg);

            // Convert enter/exit nodes to implicit if appropriate