fix corner case in `collapse_vars` (#3745)

fixes #3744

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/compress.js b/lib/compress.js
index ab89e927..763aabd8 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1384,7 +1384,10 @@ merge(Compressor.prototype, {
             function is_last_node(node, parent) {
                 if (node instanceof AST_Call) {
                     var fn = node.expression;
-                    if (fn instanceof AST_SymbolRef) fn = fn.fixed_value();
+                    if (fn instanceof AST_SymbolRef) {
+                        if (fn.definition().recursive_refs > 0) return true;
+                        fn = fn.fixed_value();
+                    }
                     if (!(fn instanceof AST_Lambda)) return true;
                     if (fn.collapse_scanning) return false;
                     fn.collapse_scanning = true;