bpo-38870: Extend subject of ast.unparse warnings (GH-21053)

- Mention that some compiler optimizations might not roundtrip
exactly (such as constant tuples and frozensets).

- Add a warning about it might raise RecursionError on very
complex expressions due to recursive unparsing aspect of ast.unparse

diff --git a/Doc/library/ast.rst b/Doc/library/ast.rst
index 6c6ad01b842c8ea9d271153ec903c174dfe051ba..25cb17811e7183e9df680f6fd2b88090ce601fcf 100644 (file)
--- a/Doc/library/ast.rst
+++ b/Doc/library/ast.rst
@@ -1553,7 +1553,12 @@ and classes for traversing abstract syntax trees:
 
    .. warning::
       The produced code string will not necessarily be equal to the original
-      code that generated the :class:`ast.AST` object.
+      code that generated the :class:`ast.AST` object (without any compiler
+      optimizations, such as constant tuples/frozensets).
+
+   .. warning::
+      Trying to unparse a highly complex expression would result with
+      :exc:`RecursionError`.
 
    .. versionadded:: 3.9