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From: Lawrence =?iso-8859-13?q?D=FFOliveiro?= <ldo@nz.invalid>
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Subject: Re: In precision typing we trust
Date: Wed, 27 Aug 2025 00:10:20 -0000 (UTC)
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On Tue, 26 Aug 2025 21:36:29 +0200, Dmitry A. Kazakov wrote:

> On 2025-08-26 18:48, Paul Rubin wrote:
>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>>
>>> Yep, as you can pass everything to anything:
>>>
>>> def F(X):
>>>     X = X + 1
>>> F(F)
>> 
>>> Very, very strong typing!
>> 
>> ==>  TypeError: unsupported operand type(s) for +: 'function' and 'int'
>> 
>> The typechecking is done at runtime, just like it says on the tin.
> 
> The error occurred inside the body of F. F itself was successfully 
> called, because it is untyped. Just as I said.

No, it was successfully entered, not successfully left. Remember, “call” 
means both “transfer” to and “return from” (otherwise it becomes “goto”, 
not “call”). That was not a “successful call”.