I just ran into a strange bug where the gensym'd suffixes on loop

control variables change to the wrong thing. The bug appears to be

triggered by a (RETURN) form inside a loop that has more than one

FOR clause. For each extra clause, the suffixes increase by one.

I haven't tried to track down the cause of the bug, but I did just push 

a failing test (LOOP-PARALLEL-CLAUSES-WITH-RETURN) to

illustrate it.

  (defun-js foo () 

    (loop :for i :from 0 :below 10 :for x = (* i 10)

      :when (> i 5) :do (return x)

      :collect i))

  

=> (note added comments below):

  function foo() {

      return (function () {

          var collect3170 = [];

          var loopResultVarSet3171 = null;

          var loopResultVar3172 = null;

          for (var i = 0; i < 10; i += 1) {

              var x3171 = i * 10;

              if (i > 5) {

                  loopResultVarSet3172 = true;  // <---- suffix should be 3171, not 3172

                  loopResultVar3173 = x3171;    // <---- suffix should be 3172, not 3173

                  break;

              };

              collect3170.push(i);

          };

          if (loopResultVarSet3171) {

              return loopResultVar3172;

          };

          return collect3170;

      })();

  };

Daniel