allow conditionals to chain

lib/trace.js

@@ -639,6 +639,17 @@ Trace.prototype.inlineConditions = function(tree, loader, conditionalEnv) {
       conditionalResolutions[c] = branches[0];
     });
 
+    // resolve any chained conditionals
+    Object.keys(conditionalResolutions).forEach(function(c) {
+      var resolution = conditionalResolutions[c];
+
+      // yes this hangs on circular...
+      while (conditionalResolutions[resolution]) {
+        resolution = conditionalResolutions[resolution];
+        conditionalResolutions[c] = resolution;
+      }
+    });
+
     // finally we do a deep clone of the tree, applying the conditional resolutions as we go
     // if we have a dependency on a condition not in the tree, we throw as it would be an unresolved external
     var inlinedTree = {};