fix corner case reduce_vars (#4300)

fixes #4297
2020-11-18 17:11:28 +00:00
parent f6a83f7944
commit fd6544b340
2 changed files with 20 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -681,6 +681,7 @@ merge(Compressor.prototype, {
                        && can_drop_symbol(sym) && safe_to_assign(tw, d)) {
                        push_ref(d, sym);
                        mark(tw, d);
+                        if (d.single_use && left instanceof AST_Destructured) d.single_use = false;
                        tw.loop_ids[d.id] = tw.in_loop;
                        mark_escaped(tw, d, sym.scope, node, node.right, 0, 1);
                        sym.fixed = d.fixed = fixed;