add loop & recur back into the language: we do actually need it!--just not *pedagogically*

src/scanner.janet

@@ -11,11 +11,13 @@
    "if" :if ## impl
    "import" :import ## impl
    "let" :let ## impl
+   "loop" :loop ## impl
    "match" :match ## impl
    "nil" :nil ## impl -> literal word
    "ns" :ns ## impl
    "panic!" :panic ## impl (should _not_ be a function)
    "pkg" :pkg
+   "recur" :recur ## impl   
    "repeat" :repeat ## impl
    "test" :test
    "then" :then ## impl
@@ -23,10 +25,6 @@
    "use" :use ## wip
    "when" :when ## impl, replaces cond
    "with" :with ## impl  
-   # removing loop & recur from the language
-   # they aren't necessary
-   # "loop" :loop ## impl
-   # "recur" :recur ## impl   
   })
 
 (def literal-words {"true" true