fix `dead_code` on escaped `return` assignment (#2693)

fixes #2692

1 files changed, 26 insertions, 0 deletions

diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js
index 7ea380d2..68ee4b12 100644
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -855,3 +855,29 @@ issue_2666: {
     }
     expect_stdout: "object"
 }
+
+issue_2692: {
+    options = {
+        dead_code: true,
+        reduce_vars: false,
+    }
+    input: {
+        function f(a) {
+            return a = g;
+            function g() {
+                return a;
+            }
+        }
+        console.log(typeof f()());
+    }
+    expect: {
+        function f(a) {
+            return a = g;
+            function g() {
+                return a;
+            }
+        }
+        console.log(typeof f()());
+    }
+    expect_stdout: "function"
+}