fixed a bug where `while` condition was compiling as statement

lib/nodes.js

@@ -1294,9 +1294,9 @@
       var cond, post, pre, rvar, set, top;
       top = del(o, 'top') && !this.returns;
       o.indent = this.idt(1);
-      o.top = true;
       this.condition.parenthetical = true;
       cond = this.condition.compile(o);
+      o.top = true;
       set = '';
       if (!top) {
         rvar = o.scope.freeVariable('result');

src/nodes.coffee

@@ -1126,9 +1126,9 @@ exports.While = class While extends Base
   compileNode: (o) ->
     top      =  del(o, 'top') and not @returns
     o.indent =  @idt 1
-    o.top    =  true
     @condition.parenthetical = yes
     cond     =  @condition.compile(o)
+    o.top    =  true
     set      =  ''
     unless top
       rvar  = o.scope.freeVariable 'result'

test/test_while.coffee

@@ -47,3 +47,7 @@ loop
   list.push i * 2
 
 ok list.join(' ') is '8 6 4 2'
+
+
+#759: `if` within `while` condition
+2 while if 1 then 0