fix corner case in `reduce_vars` (#4283)

fixes #4282

1 files changed, 25 insertions, 1 deletions

diff --git a/test/compress/destructured.js b/test/compress/destructured.js
index 169bfb7d..65429b92 100644
--- a/test/compress/destructured.js
+++ b/test/compress/destructured.js
@@ -541,7 +541,7 @@ funarg_reduce_vars_3: {
         (function({
             [a++]: b
         }) {})(0);
-        console.log(1);
+        console.log(a);
     }
     expect_stdout: "1"
     node_version: ">=6"
@@ -1317,3 +1317,27 @@ issue_4280: {
     expect_stdout: "undefined"
     node_version: ">=6"
 }
+
+issue_4282: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            ({
+                [a = "bar"]: 0[console.log(a)],
+            } = 0);
+        })("foo");
+    }
+    expect: {
+        (function(a) {
+            ({
+                [a = "bar"]: 0[console.log(a)],
+            } = 0);
+        })("foo");
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}