fix corner cases in `inline` & `unused` (#4509)

fixes #4508

2 files changed, 36 insertions, 7 deletions

diff --git a/test/compress/destructured.js b/test/compress/destructured.js
index f9d32ce0..a476705d 100644
--- a/test/compress/destructured.js
+++ b/test/compress/destructured.js
@@ -2356,3 +2356,31 @@ issue_4504: {
     expect_stdout: "PASS"
     node_version: ">=6"
 }
+
+issue_4508: {
+    options = {
+        inline: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        for (var i = 0; i < 2; i++)
+            (function f([ a ]) {
+                var a = console.log(a) && b, b = null;
+            })([ "PASS" ]);
+    }
+    expect: {
+        for (var i = 0; i < 2; i++)
+            [ [ a ] ] = [ [ "PASS" ] ],
+            b = void 0,
+            a = console.log(a) && b,
+            b = null,
+            void 0;
+        var a, b;
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+    ]
+    node_version: ">=6"
+}
diff --git a/test/compress/drop-unused.js b/test/compress/drop-unused.js
index ae1a6e5b..bb47682c 100644
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2669,8 +2669,7 @@ issue_3956: {
         })();
     }
     expect: {
-        var c, d;
-        c += 0,
+        var d;
         console.log(NaN),
         d = 1 ^ console.log(1),
         console.log(d);
@@ -2703,13 +2702,13 @@ issue_3962_1: {
     }
     expect: {
         var a = 0;
-        a = (function(c) {
+        (function(c) {
             do {
                 console;
                 0..toString();
             } while (0);
             if (c) console.log("PASS");
-        }(1), 0);
+        })(1);
         void 0;
     }
     expect_stdout: "PASS"
@@ -2736,13 +2735,13 @@ issue_3962_2: {
     }
     expect: {
         var a = 0;
-        a = (function(c) {
+        (function(c) {
             do {
                 console;
                 0..toString();
             } while (0);
             if (c) console.log("PASS");
-        }(1), 0);
+        })(1);
     }
     expect_stdout: "PASS"
 }
@@ -2799,7 +2798,9 @@ issue_4017: {
         var a = 0;
         console.log(function() {
             c &= 0;
-            var c = (a++, A = a, 0);
+            var c;
+            a++,
+            A = a;
         }());
     }
     expect_stdout: "undefined"