fix corner case in collapse_vars (#3521)

fixes #3520
2019-10-24 01:13:57 +08:00
parent 370c8e0385
commit 0f7aa41e33
3 changed files with 43 additions and 4 deletions
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2121,7 +2121,8 @@ issue_3515_1: {
    expect: {
        var c = 0;
        (function() {
-            for (var key20 in !(this[c++] = 0));
+            this[c++] = 0;
+            for (var key20 in !0);
        })();
        console.log(c);
    }