sanitize RTS string output

README.md

@@ -101,6 +101,7 @@ Alternatively, your syntax checker may fail to do anything at all, because of th
 - Tail recursion
 - Lambdas with arbitrary signatures
 - update the wat AST in the README to reflect more recent changes
+- RTS printing for heap structures
 
 ## Complete
 

server/public/runtime.js

@@ -66,7 +66,7 @@ function run(){
         console.log("unwrapped: ", unwrappedResult);
         result = unwrappedResult;
         console.log("result: ", result);
-        output.innerHTML = output.innerHTML + result;
+        output.innerHTML = output.innerHTML + result.replace("<", "&lt;").replace(">", "&gt;");
       })();
 }
 

tests/hustle/8.wkt

@@ -0,0 +1,2 @@
+#lang wacket
+(cdr (cons #\a (cons #\b '())))