fix corner case in reduce_vars (#3881)

fixes #3880
2020-05-11 19:29:33 +01:00
parent 2b24dc25fb
commit e8a7956b6f
2 changed files with 27 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -797,8 +797,12 @@ merge(Compressor.prototype, {
                    d.recursive_refs++;
                } else if (value && ref_once(tw, compressor, d)) {
                    d.in_loop = tw.loop_ids[d.id] !== tw.in_loop;
-                    d.single_use = value instanceof AST_Lambda && !value.pinned()
-                        || !d.in_loop && d.scope === this.scope && value.is_constant_expression();
+                    d.single_use = value instanceof AST_Lambda
+                            && !value.pinned()
+                            && (!d.in_loop || tw.parent() instanceof AST_Call)
+                        || !d.in_loop
+                            && d.scope === this.scope
+                            && value.is_constant_expression();
                } else {
                    d.single_use = false;
                }