fix corner case in merge_vars (#4256)

fixes #4255
2020-11-01 06:34:07 +00:00
parent cbf7269296
commit 68091dbf69
2 changed files with 29 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4542,7 +4542,7 @@ merge(Compressor.prototype, {
            }
            if (node instanceof AST_LabeledStatement) {
                push();
-                segment.block = node.body;
+                segment.block = node;
                node.body.walk(tw);
                pop();
                return true;
@@ -4737,7 +4737,12 @@ merge(Compressor.prototype, {

        function insert(target) {
            var stack = [];
-            while (!HOP(segment, "block") || segment.block !== target) {
+            while (true) {
+                if (HOP(segment, "block")) {
+                    var block = segment.block;
+                    if (block instanceof AST_LabeledStatement) block = block.body;
+                    if (block === target) break;
+                }
                stack.push(segment);
                pop();
            }