From ac51d4c5a079dccbc9a6cf69d06f757432c69694 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Fri, 24 Mar 2017 19:31:17 +0800
Subject: fix corner case in `AST_For.init` (#1652)

Enforce `null` as value for empty initialisation blocks.

fixes #1648
---
 lib/compress.js | 1 +
 lib/output.js   | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/compress.js b/lib/compress.js
index cbcb7b86..3804a932 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2327,6 +2327,7 @@ merge(Compressor.prototype, {
     };
 
     OPT(AST_For, function(self, compressor){
+        if (is_empty(self.init)) self.init = null;
         if (!compressor.option("loops")) return self;
         if (self.condition) {
             var cond = self.condition.evaluate(compressor);
diff --git a/lib/output.js b/lib/output.js
index 767abd4d..c0f10523 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -799,7 +799,7 @@ function OutputStream(options) {
         output.print("for");
         output.space();
         output.with_parens(function(){
-            if (self.init && !(self.init instanceof AST_EmptyStatement)) {
+            if (self.init) {
                 if (self.init instanceof AST_Definitions) {
                     self.init.print(output);
                 } else {
-- 
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