fix corner case in dead_code (#3991)

2020-06-12 01:00:19 +01:00
parent e9465717ab
commit a82ca62b66
2 changed files with 29 additions and 11 deletions
--- a/test/compress/dead-code.js
+++ b/test/compress/dead-code.js
@@ -1290,12 +1290,37 @@ self_assignments_5: {
    }
    expect: {
        var i = 0, l = [ "FAIL", "PASS" ];
+        l[0];
+        l[0];
        l[0] = l[1];
        console.log(l[0], 2);
    }
    expect_stdout: "PASS 2"
 }

+self_assignments_6: {
+    options = {
+        dead_code: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        var o = {
+            p: "PASS",
+        };
+        console.log(o.p = o.p);
+    }
+    expect: {
+        var o = {
+            p: "PASS",
+        };
+        console.log(o.p);
+    }
+    expect_stdout: "PASS"
+}
+
 issue_3967: {
    options = {
        dead_code: true,