fix `top_retain` on `hoist_props` (#2474)

fixes #2473

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/compress.js b/lib/compress.js
index 54ac3d75..0635c41d 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -2769,6 +2769,7 @@ merge(Compressor.prototype, {
     AST_Scope.DEFMETHOD("hoist_properties", function(compressor){
         var self = this;
         if (!compressor.option("hoist_props") || compressor.has_directive("use asm")) return self;
+        var top_retain = self instanceof AST_Toplevel && compressor.top_retain || return_false;
         var defs_by_id = Object.create(null);
         var var_names = Object.create(null);
         self.enclosed.forEach(function(def) {
@@ -2784,6 +2785,7 @@ merge(Compressor.prototype, {
                     && !(def = sym.definition()).escaped
                     && !def.single_use
                     && !def.direct_access
+                    && !top_retain(def)
                     && (value = sym.fixed_value()) === node.value
                     && value instanceof AST_Object) {
                     var defs = new Dictionary();