fix corner case in `unused` (#4757)

fixes #4756

1 files changed, 17 insertions, 20 deletions

diff --git a/lib/compress.js b/lib/compress.js
index a92ad97d..e207fed1 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7323,31 +7323,28 @@ merge(Compressor.prototype, {
                 if (!base && !values) return null;
                 exprs = [];
             }
-            if (values) {
-                var fn = make_node(AST_Arrow, this, {
-                    argnames: [],
-                    body: [],
-                    value: make_sequence(this, values),
-                });
-                fn.init_vars(this.parent_scope);
-                exprs.push(make_node(AST_Call, this, {
-                    args: [],
-                    expression: fn,
+            if (base) {
+                var node = to_class_expr(this, true);
+                node.properties = [];
+                if (exprs.length) node.properties.push(make_node(AST_ClassMethod, this, {
+                    key: make_sequence(this, exprs),
+                    value: make_node(AST_Function, this, {
+                        argnames: [],
+                        body: [],
+                    }).init_vars(node),
                 }));
+                exprs = [ node ];
+
             }
-            exprs = exprs.length ? make_sequence(this, exprs) : null;
-            if (!base) return exprs;
-            var node = make_node(AST_ClassExpression, this, this);
-            node.name = null;
-            node.properties = [];
-            if (exprs) node.properties.push(make_node(AST_ClassMethod, this, {
-                key: exprs,
-                value: make_node(AST_Function, this, {
+            if (values) exprs.push(make_node(AST_Call, this, {
+                expression: make_node(AST_Arrow, this, {
                     argnames: [],
                     body: [],
-                }).init_vars(node),
+                    value: make_sequence(this, values),
+                }).init_vars(this.parent_scope),
+                args: [],
             }));
-            return node;
+            return make_sequence(this, exprs);
         });
         def(AST_Conditional, function(compressor) {
             var consequent = this.consequent.drop_side_effect_free(compressor);