scan within IIFEs of assigned values (#2702)

fixes #2701

2 files changed, 30 insertions, 3 deletions

diff --git a/lib/compress.js b/lib/compress.js
index ee80901e..73cc9d7b 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4913,9 +4913,8 @@ merge(Compressor.prototype, {
             if (reachable) return true;
             if (node instanceof AST_Scope && node !== self) {
                 var parent = scan_scope.parent();
-                if (!(parent instanceof AST_Call && parent.expression === node)) {
-                    node.walk(find_ref);
-                }
+                if (parent instanceof AST_Call && parent.expression === node) return;
+                node.walk(find_ref);
                 return true;
             }
         });
diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js
index 68ee4b12..32bb88e6 100644
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -881,3 +881,31 @@ issue_2692: {
     }
     expect_stdout: "function"
 }
+
+issue_2701: {
+    options = {
+        dead_code: true,
+        inline: false,
+    }
+    input: {
+        function f(a) {
+            return a = function() {
+                return function() {
+                    return a;
+                };
+            }();
+        }
+        console.log(typeof f()());
+    }
+    expect: {
+        function f(a) {
+            return a = function() {
+                return function() {
+                    return a;
+                };
+            }();
+        }
+        console.log(typeof f()());
+    }
+    expect_stdout: "function"
+}