Issue #19392: Document that imp.reload() now relies on __loader__

being defined on top of __name__.

Doc/library/imp.rst

@@ -172,6 +172,10 @@ This module provides an interface to the mechanisms used to implement the
    the class does not affect the method definitions of the instances --- they
    continue to use the old class definition.  The same is true for derived classes.
 
+   .. versionchanged:: 3.3
+      Relies on both ``__name__`` and ``__loader__`` being defined on the module
+      being reloaded instead of just ``__name__``.
+
 
 The following functions are conveniences for handling :pep:`3147` byte-compiled
 file paths.

Misc/NEWS

@@ -531,6 +531,9 @@ Tests
 Documentation
 -------------
 
+- Issue #19392: Document that `imp.reload()` now also requires `__loader__` to
+  be set on the module being reloaded.
+
 - Issue #18758: Fixed and improved cross-references.
 
 - Issue #18743: Fix references to non-existant "StringIO" module.