enhance assignments & unused (#3428)

closes #3427
2019-05-29 01:21:08 +08:00
parent e4f5ba1d29
commit 482e1baea3
4 changed files with 123 additions and 24 deletions
--- a/test/compress/drop-unused.js
+++ b/test/compress/drop-unused.js
@@ -2028,3 +2028,37 @@ issue_3375: {
    }
    expect_stdout: "0 0"
 }
+
+issue_3427_1: {
+    options = {
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a;
+            a = a || {};
+        })();
+    }
+    expect: {}
+}
+
+issue_3427_2: {
+    options = {
+        unused: true,
+    }
+    input: {
+        (function() {
+            var s = "PASS";
+            console.log(s = s || "FAIL");
+        })();
+    }
+    expect: {
+        (function() {
+            var s = "PASS";
+            console.log(s = s || "FAIL");
+        })();
+    }
+    expect_stdout: "PASS"
+}