From ae77ebe5a5f1be4b2634036f48d8b570b569cb21 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sun, 19 May 2019 12:59:40 +0800
Subject: fix corner case in `arguments` (#3421)

fixes #3420
---
 test/compress/keep_fargs.js | 66 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

(limited to 'test/compress/keep_fargs.js')

diff --git a/test/compress/keep_fargs.js b/test/compress/keep_fargs.js
index b23e96f0..558b10bb 100644
--- a/test/compress/keep_fargs.js
+++ b/test/compress/keep_fargs.js
@@ -1051,3 +1051,69 @@ function_name_mangle_ie8: {
     expect_exact: "(function(){console.log(typeof function o(){})})();"
     expect_stdout: "function"
 }
+
+issue_3420_1: {
+    options = {
+        keep_fargs: "strict",
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            return function(a, b, c, d) {
+                return a + b;
+            };
+        }().length);
+    }
+    expect: {
+        console.log(function() {
+            return function(a, b, c, d) {
+                return a + b;
+            };
+        }().length);
+    }
+    expect_stdout: "4"
+}
+
+issue_3420_2: {
+    options = {
+        inline: true,
+        keep_fargs: "strict",
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            return function(a, b, c, d) {
+                return a + b;
+            };
+        }().length);
+    }
+    expect: {
+        console.log(function(a, b, c, d) {
+            return a + b;
+        }.length);
+    }
+    expect_stdout: "4"
+}
+
+issue_3420_3: {
+    options = {
+        inline: true,
+        keep_fargs: "strict",
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            function f(a, b, c, d) {
+                return a + b;
+            }
+            return f;
+        }().length);
+    }
+    expect: {
+        console.log(function(a, b, c, d) {
+            return a + b;
+        }.length);
+    }
+    expect_stdout: "4"
+}
-- 
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