fix corner case in ie8 (#4251)

fixes #4250
2020-10-30 03:06:31 +00:00
parent 5d12abc41b
commit 2e0ad40fe6
2 changed files with 31 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5200,7 +5200,10 @@ merge(Compressor.prototype, {
                var def = sym.definition();
                if (!def) return;
                if (def.id in in_use_ids) return;
-                if (def.scope !== self && self.find_variable(sym) === def) return;
+                if (def.scope !== self) {
+                    var d = self.find_variable(sym);
+                    if ((d && d.redefined() || d) === def) return;
+                }
                log(sym, "Dropping unused loop variable {name}");
                if (for_ins[def.id] === node) delete for_ins[def.id];
                var body = [];