fix corner case in reduce_vars (#5099)

fixes #5098
2021-07-24 00:10:14 +01:00
parent 6a3fe9d1df
commit 657d525c80
2 changed files with 34 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -981,7 +981,10 @@ merge(Compressor.prototype, {
                    if (fixed && !modified && !sym.in_arg && safe_to_assign(tw, d)) {
                        push_ref(d, sym);
                        mark(tw, d);
-                        if (d.single_use && left instanceof AST_Destructured) d.single_use = false;
+                        if (left instanceof AST_Destructured
+                            || d.orig.length == 1 && d.orig[0] instanceof AST_SymbolDefun) {
+                            d.single_use = false;
+                        }
                        tw.loop_ids[d.id] = tw.in_loop;
                        mark_escaped(tw, d, sym.scope, node, right, 0, 1);
                        sym.fixed = d.fixed = fixed;