fix corner case in `unused` (#3987)

fixes #3986

1 files changed, 34 insertions, 0 deletions

diff --git a/test/compress/drop-unused.js b/test/compress/drop-unused.js
index 8c912a57..b66320ad 100644
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2755,3 +2755,37 @@ issue_3962_2: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3986: {
+    options = {
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 0, b = 0;
+        (function() {
+            try {
+                throw 42;
+            } catch (e) {
+                a++;
+            }
+            b = b && 0;
+        })(b *= a);
+        console.log(b);
+    }
+    expect: {
+        var a = 0, b = 0;
+        (function() {
+            try {
+                throw 42;
+            } catch (e) {
+                a++;
+            }
+            b = b && 0;
+        })(b *= a);
+        console.log(b);
+    }
+    expect_stdout: "0"
+}