Update escope to use new esrecurse with fallback

Author: nzakas

package.json

@@ -21,7 +21,7 @@
   "dependencies": {
     "es6-map": "^0.1.3",
     "es6-weak-map": "^2.0.1",
-    "esrecurse": "^4.0.0",
+    "esrecurse": "^4.1.0",
     "estraverse": "^4.1.1"
   },
   "devDependencies": {

test/fallback.js

@@ -38,7 +38,7 @@ describe('fallback option', function() {
         }).to.throw("Unknown node type NumericLiteral");
     });
 
-    it('should not raise an error even if it encountered an unknown node.', function() {
+    it('should not raise an error even if it encountered an unknown node when fallback is iteration.', function() {
         const ast = esprima.parse(`
             var foo = 0;
         `);
@@ -48,6 +48,16 @@ describe('fallback option', function() {
         analyze(ast); // default is `fallback: 'iteration'`
         analyze(ast, {fallback: 'iteration'});
     });
+
+    it('should not raise an error even if it encountered an unknown node when fallback is a function.', function() {
+        const ast = esprima.parse(`
+            var foo = 0;
+        `);
+
+        ast.body[0].declarations[0].init.type = 'NumericLiteral';
+
+        analyze(ast, {fallback: node => Object.keys(node)});
+    });
 });
 
 // vim: set sw=4 ts=4 et tw=80 :