From 21968285e8fad1cfe775b389c6bcd16e14b62c6c Mon Sep 17 00:00:00 2001
From: Mihai Bazon <mihai@bazon.net>
Date: Tue, 18 Sep 2012 10:53:46 +0300
Subject: [PATCH] added AST_NaN (output as 0/0)

---
 lib/ast.js      | 5 +++++
 lib/compress.js | 9 ++++++---
 lib/output.js   | 3 +++
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/lib/ast.js b/lib/ast.js
index 55e95033..39a62b16 100644
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -661,6 +661,11 @@ var AST_Null = DEFNODE("Null", null, {
     value: null
 }, AST_Atom);
 
+var AST_NaN = DEFNODE("NaN", null, {
+    $documentation: "The impossible value",
+    value: 0/0
+}, AST_Atom);
+
 var AST_Undefined = DEFNODE("Undefined", null, {
     $documentation: "The `undefined` value",
     value: (function(){}())
diff --git a/lib/compress.js b/lib/compress.js
index ca7bfe51..aedd78fd 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -526,9 +526,9 @@ function Compressor(options, false_by_default) {
                     });
                     break;
                   case "number":
-                    ast = make_node(AST_Number, this, {
+                    ast = make_node(isNaN(val) ? AST_NaN : AST_Number, this, {
                         value: val
-                    });
+                    }).optimize(compressor);
                     break;
                   case "boolean":
                     ast = make_node(val ? AST_True : AST_False, this);
@@ -1501,8 +1501,11 @@ function Compressor(options, false_by_default) {
     });
 
     AST_SymbolRef.DEFMETHOD("optimize", function(compressor){
-        if (this.name == "undefined" && this.undeclared()) {
+        if (this.undeclared()) switch (this.name) {
+          case "undefined":
             return make_node(AST_Undefined, this).optimize(compressor);
+          case "NaN":
+            return make_node(AST_NaN, this).optimize(compressor);
         }
         return this;
     });
diff --git a/lib/output.js b/lib/output.js
index 96221599..ee11aebc 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -894,6 +894,9 @@ function OutputStream(options) {
         output.print("void 0");
         //output.print("[][0]");
     });
+    DEFPRINT(AST_NaN, function(self, output){
+        output.print("0/0");
+    });
     DEFPRINT(AST_This, function(self, output){
         output.print("this");
     });
-- 
2.34.1