Fixing Issue #506. existential chains should force parentheses in the presense of a compiled ternary operator.

lib/nodes.js

@@ -1598,6 +1598,7 @@
     };
     IfNode.prototype.compileTernary = function(o) {
       var elsePart, ifPart;
+      o.operation = true;
       ifPart = this.condition.compile(o) + ' ? ' + this.bodyNode().compile(o);
       elsePart = this.elseBody ? this.elseBodyNode().compile(o) : 'null';
       return "" + ifPart + " : " + elsePart;

src/nodes.coffee

@@ -1402,8 +1402,9 @@ exports.IfNode: class IfNode extends BaseNode
 
   # Compile the IfNode as a ternary operator.
   compileTernary: (o) ->
-    ifPart:    @condition.compile(o) + ' ? ' + @bodyNode().compile(o)
-    elsePart:  if @elseBody then @elseBodyNode().compile(o) else 'null'
+    o.operation: true
+    ifPart:      @condition.compile(o) + ' ? ' + @bodyNode().compile(o)
+    elsePart:    if @elseBody then @elseBodyNode().compile(o) else 'null'
     "$ifPart : $elsePart"
 
 # Faux-Nodes

test/test_existence.coffee

@@ -93,3 +93,8 @@ ok result is undefined
 # Assign to the result of an exsitential operation with a minus.
 x: null ? - 1
 ok x is - 1
+
+
+# Things that compile to ternaries should force parentheses, like operators do.
+duration: if options?.animated then 150 else 0
+ok duration is 0