fix invalid `AST_For.init` (#1657)

Turns out the only place in `Compressor` which can generate invalid `AST_For.init` is within `drop_unused()`, so focus the fix-up efforts.

supercedes #1652
fixes #1656

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/compress.js b/lib/compress.js
index e13985ee..ab7cca6f 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1961,6 +1961,9 @@ merge(Compressor.prototype, {
                             return in_list ? MAP.splice(body) : make_node(AST_BlockStatement, node, {
                                 body: body
                             });
+                        } else if (is_empty(node.init)) {
+                            node.init = null;
+                            return node;
                         }
                     }
                     if (node instanceof AST_Scope && node !== self)
@@ -2327,7 +2330,6 @@ 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);