From fb0d03e6a3364e9210464f8ac41f978ac4288cf3 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Tue, 2 Jun 2020 21:34:43 +0800
Subject: [PATCH] fix corner case in `hoist_props`

fixes #3945
---
 lib/compress.js              |  3 +++
 test/compress/hoist_props.js | 23 +++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/lib/compress.js b/lib/compress.js
index 3728884f..120ceab1 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -5074,6 +5074,9 @@ merge(Compressor.prototype, {
                 && right.properties.length > 0
                 && all(right.properties, function(prop) {
                     return prop instanceof AST_ObjectKeyVal;
+                })
+                && all(def.references, function(ref) {
+                    return ref.fixed_value() === right;
                 });
         }
     });
diff --git a/test/compress/hoist_props.js b/test/compress/hoist_props.js
index a73df1f5..4fcbd796 100644
--- a/test/compress/hoist_props.js
+++ b/test/compress/hoist_props.js
@@ -972,3 +972,26 @@ issue_3871: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3945: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+    }
+    input: {
+        function f() {
+            o.p;
+            var o = {
+                q: 0,
+            };
+        }
+    }
+    expect: {
+        function f() {
+            o.p;
+            var o = {
+                q: 0,
+            };
+        }
+    }
+}