fix corner case in collapse_vars (#3898)

fixes #3897
2020-05-14 18:09:54 +01:00
parent 938368ba21
commit 5ef7060098
2 changed files with 40 additions and 4 deletions
--- a/test/compress/collapse_vars.js
+++ b/test/compress/collapse_vars.js
@@ -8050,3 +8050,37 @@ issue_3894: {
        "PASS",
    ]
 }
+
+issue_3897: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var a = 0;
+        (function() {
+            function f(b) {
+                b = a = 1 + a;
+                a = 1 + a;
+                console.log(b);
+            }
+            f();
+        })();
+        console.log(a);
+    }
+    expect: {
+        var a = 0;
+        (function() {
+            function f(b) {
+                b = a = 1 + a;
+                a = 1 + a;
+                console.log(b);
+            }
+            f();
+        })();
+        console.log(a);
+    }
+    expect_stdout: [
+        "1",
+        "2",
+    ]
+}