From aa3a5fa0a10b7ecf2a3aedc669c58b016bfd21ad Mon Sep 17 00:00:00 2001
From: Jon Ludlam <jon@recoil.org>
Date: Mon, 7 Jul 2025 11:41:07 +0000
Subject: [PATCH 1/2] fs_fake: implement rename

---
 runtime/js/fs_fake.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/runtime/js/fs_fake.js b/runtime/js/fs_fake.js
index 8c55bb7488..ee50676c6b 100644
--- a/runtime/js/fs_fake.js
+++ b/runtime/js/fs_fake.js
@@ -81,6 +81,17 @@ class MlFakeDevice {
     }
   }
 
+  rename(oldname, newname) {
+    if (this.exists(newname))
+      caml_raise_sys_error(this.nm(newname) + " : file already exists");
+    if (!this.exists(oldname))
+      caml_raise_sys_error(this.nm(oldname) + " : no such file or directory");
+    if (this.is_dir(oldname))
+      caml_raise_sys_error(this.nm(oldname) + " : not a file");
+    this.content[newname] = this.content[oldname];
+    delete this.content[oldname];
+  }
+
   mkdir(name, _mode, raise_unix) {
     if (this.exists(name))
       caml_raise_system_error(

From e1ca220af261b168fa6fe52ffd7e7913c15ada50 Mon Sep 17 00:00:00 2001
From: Jon Ludlam <jon@recoil.org>
Date: Tue, 15 Jul 2025 18:00:42 +0100
Subject: [PATCH 2/2] CHANGES

---
 CHANGES.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGES.md b/CHANGES.md
index 3490684715..f5e6ee00d9 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,7 @@
 
 ## Features/Changes
 * Compiler: exit-loop-early in more cases (#2077)
+* Runtime: support rename in fake filesystem (#2080)
 
 # 6.1.1 (2025-07-07) - Lille