fix corner case in ie8 & reduce_vars (#4020)

fixes #4019
2020-07-21 09:17:02 +01:00
parent bce3919748
commit cd671221c5
3 changed files with 29 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -894,6 +894,7 @@ merge(Compressor.prototype, {
            d.assignments++;
            var fixed = d.fixed;
            if (safe_to_read(tw, d) && safe_to_assign(tw, d)) {
+                if (d.single_use) d.single_use = false;
                push_ref(d, exp);
                mark(tw, d);
                d.fixed = function() {