From b4ff6d0f2da3f094cf1bb4897a2dc67ad4f3efa5 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 26 Sep 2020 08:31:33 +0100
Subject: fix corner cases in `functions` & `merge_vars` (#4156)

fixes #4155
---
 test/compress/functions.js  | 31 +++++++++++++++++++++++++++++++
 test/compress/merge_vars.js | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)

(limited to 'test')

diff --git a/test/compress/functions.js b/test/compress/functions.js
index 3027d59e..1be01167 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -4777,3 +4777,34 @@ issue_4006: {
     }
     expect_stdout: "-1"
 }
+
+issue_4155: {
+    options = {
+        functions: true,
+        inline: true,
+        merge_vars: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a;
+            (function() {
+                console.log(a);
+            })(a);
+            var b = function() {};
+            b && console.log(typeof b);
+        })();
+    }
+    expect: {
+        (function() {
+            void console.log(b);
+            var b = function() {};
+            b && console.log(typeof b);
+        })();
+    }
+    expect_stdout: [
+        "undefined",
+        "function",
+    ]
+}
diff --git a/test/compress/merge_vars.js b/test/compress/merge_vars.js
index b86b0e99..7eb3f13c 100644
--- a/test/compress/merge_vars.js
+++ b/test/compress/merge_vars.js
@@ -2822,3 +2822,41 @@ conditional_write: {
     }
     expect_stdout: "PASS,42"
 }
+
+issue_4155: {
+    options = {
+        inline: true,
+        merge_vars: true,
+    }
+    input: {
+        (function() {
+            try {
+                throw "PASS";
+            } catch (e) {
+                var a;
+                (function() {
+                    console.log(e, a);
+                })(a = NaN);
+            }
+            var e = function() {};
+            e && console.log(typeof e);
+        })();
+    }
+    expect: {
+        (function() {
+            try {
+                throw "PASS";
+            } catch (e) {
+                var a;
+                a = NaN,
+                void console.log(e, a);
+            }
+            var e = function() {};
+            e && console.log(typeof e);
+        })();
+    }
+    expect_stdout: [
+        "PASS NaN",
+        "function",
+    ]
+}
-- 
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