bug#34318: 26.1.90; Strange behavior of two line message with running shell

[martin rudalics]

>> M-: (message "1\n2")
>>
>> -> one line message "1\n2".
>
> That's not the message, it's the echo of the return value.

Sure.  I used this recipe because I found it in the context of
Bug#34179 (and reported it there already) but could not reproduce it
otherwise.

martin