Failure to report syntax warning

[simon-grantham]

Bug report

Bug description:

The expression: True is bool fails to yield a syntax warning even though other literals do so.

$ uname -v
#14~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jan 15 15:52:10 UTC 2
$
$ python3 --version
Python 3.12.3
$
$ python3
Python 3.12.3 (main, Jan 22 2026, 20:57:42) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> print(1 is int)
<stdin>:1: SyntaxWarning: "is" with 'int' literal. Did you mean "=="?
False
>>> print(True is bool)
False
>>> 

CPython versions tested on:

3.12

Operating systems tested on:

Linux

[serhiy-storchaka]

True is a singleton. Using is with True is valid, it always produce the same result.

On other hand, caching small integers is an implementation detail. On other implementations they can be not cached or not always cached.