fix corner case in merge_vars (#5143)

fixes #5142
2021-10-04 17:42:46 +01:00
parent 87b99162fb
commit c8b0f685ee
2 changed files with 32 additions and 1 deletions
--- a/test/compress/classes.js
+++ b/test/compress/classes.js
@@ -2066,3 +2066,34 @@ issue_5082_2: {
    expect_stdout: "PASS"
    node_version: ">=12"
 }
+
+issue_5142: {
+    options = {
+        evaluate: true,
+        merge_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = 0, b;
+        if (++a)
+            new class {
+                p = b = null;
+                constructor(c) {
+                    console.log(c ? "FAIL" : "PASS");
+                }
+            }(b, a);
+    }
+    expect: {
+        var a = 0, b;
+        if (++a)
+            new class {
+                p = b = null;
+                constructor(c) {
+                    console.log(c ? "FAIL" : "PASS");
+                }
+            }(b, 1);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=12"
+}