From f34fbb2c36b2fd1cfe38aa12d103cdeb3916c73d Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L." <alexlamsl@gmail.com>
Date: Wed, 14 Aug 2024 01:35:47 +0300
Subject: [PATCH] fix corner case in `reduce_vars` (#5919)

fixes #5917
---
 lib/compress.js               |  4 ----
 test/compress/pure_getters.js | 36 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/lib/compress.js b/lib/compress.js
index 1e358599f5f..5438cc54da7 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -601,10 +601,6 @@ Compressor.prototype.compress = function(node) {
             fn.enclosed.forEach(function(d) {
                 if (fn.variables.get(d.name) === d) return;
                 if (safe_to_read(tw, d)) return;
-                d.single_use = false;
-                var fixed = d.fixed;
-                if (typeof fixed == "function") fixed = fixed();
-                if (fixed instanceof AST_Lambda && fixed.safe_ids !== undefined) return;
                 d.fixed = false;
             });
         }
diff --git a/test/compress/pure_getters.js b/test/compress/pure_getters.js
index 7f2ec4e8810..1e6509e1c52 100644
--- a/test/compress/pure_getters.js
+++ b/test/compress/pure_getters.js
@@ -1715,3 +1715,39 @@ issue_5856: {
     }
     expect_stdout: "PASS"
 }
+
+issue_5917: {
+    options = {
+        pure_getters: "strict",
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        var a;
+        console || (a = function() {})(f);
+        function f() {
+            a.p;
+        }
+        try {
+            f();
+            console.log("FAIL");
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        var a;
+        console || (a = function() {})(f);
+        function f() {
+            a.p;
+        }
+        try {
+            f();
+            console.log("FAIL");
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+}