Switch to immutable sets.

Signed-off-by: Edward Z. Yang <[email protected]>

Author: ezyang

lib/eval.js

@@ -1,5 +1,5 @@
 var Expr = require('./expr');
-var Set = require('set');
+var Set = require('immutable').Set;
 
 
 // This is basically an interactive tutorial you can run

package.json

@@ -9,8 +9,8 @@
   "dependencies": {
     "adt" : "~0.7.2",
     "parsimmon" : "~0.5.1",
-    "set" : "~1.1.1",
-    "util-is" : "~0.1.0"
+    "util-is" : "~0.1.0",
+    "immutable": "~2.0.17"
   },
   "author": "Deian Stefan <[email protected]> (http://deian.net/)",
   "license": "MIT"

setup.js

@@ -1,5 +1,6 @@
 
 var Expr = require('./lib/expr');
+var Set = require('immutable').Set;
 
 var t1 = Expr.parse('(/x. y) ((/x. x x) (/y. y))');
 var t2 = Expr.parse('(/x. (/y. x y)) (/x. (x y) z)');