Fix etils adhoc crash with module not supporting weakref

PiperOrigin-RevId: 737983119

Author: Conchylicultor

CHANGELOG.md

@@ -10,6 +10,7 @@ Changelog follow https://keepachangelog.com/ format.
 
 *  `ecolab.adhoc`:
     *   Better error message for adhoc invalidate with `epy.reraise`
+    *   Fix crash when importing module not supporting weak_ref
 
 ## [1.12.2] - 2025-03-10
 

etils/ecolab/inplace_reload.py

@@ -180,7 +180,13 @@ class _ModuleRefs:
 
   def save_module(self, module: types.ModuleType) -> None:
     """Save reference on all previous modules/objects."""
-    self.modules.append(weakref.ref(module))
+    try:
+      weak_module = weakref.ref(module)
+    except TypeError:
+      # Some modules, like '_bcrypt.lib' raises:
+      # TypeError: cannot create weak reference to '_cffi_backend.Lib' object
+      return
+    self.modules.append(weak_module)
 
     for name, old_obj in module.__dict__.items():
       # Only update objects part of the module (filter other imported symbols)