fix corner case in unused (#5080)

fixes #5079
2021-07-14 16:02:45 +01:00
parent 8e2dff632e
commit f18804fa06
2 changed files with 27 additions and 2 deletions
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -3469,3 +3469,26 @@ issue_4912_3: {
    }
    expect_stdout: "PASS"
 }
+
+issue_5079: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a;
+        do {
+            (a = 123456).p = a;
+            a.q = null;
+        } while (console.log("PASS"));
+    }
+    expect: {
+        do {
+            0, 0, null;
+        } while (console.log("PASS"));
+    }
+    expect_stdout: "PASS"
+}