enhance `dead_code` (#3551)

2 files changed, 63 insertions, 0 deletions

diff --git a/test/compress/dead-code.js b/test/compress/dead-code.js
index 190a3243..501d55ec 100644
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -1013,3 +1013,32 @@ issue_3406: {
     }
     expect_stdout: "true"
 }
+
+function_assign: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        console.log(function() {
+            var a = "PASS";
+            function h(c) {
+                return c;
+            }
+            h.p = function(b) {
+                return b;
+            }.p = a;
+            return h;
+        }().p);
+    }
+    expect: {
+        console.log(function() {
+            var a = "PASS";
+            function h(c) {
+                return c;
+            }
+            h.p = a;
+            return h;
+        }().p);
+    }
+    expect_stdout: "PASS"
+}
diff --git a/test/compress/drop-unused.js b/test/compress/drop-unused.js
index f77072b0..7cb2e899 100644
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2187,3 +2187,37 @@ issue_3515_3: {
     }
     expect_stdout: "PASS"
 }
+
+function_assign: {
+    options = {
+        pure_getters: "strict",
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            var a = "PASS";
+            function g(b) {
+                return b;
+            }
+            g.p = a;
+            function h(c) {
+                return c;
+            }
+            h.p = a;
+            return h;
+        }().p);
+    }
+    expect: {
+        console.log(function() {
+            var a = "PASS";
+            function h(c) {
+                return c;
+            }
+            h.p = a;
+            return h;
+        }().p);
+    }
+    expect_stdout: "PASS"
+}