Re: RFC: String interpolation

[Paul Eggert]

On 12/13/2016 04:10 PM, John Wiegley wrote:
> This way you could just say:
>
>      (format "This %d" 10 " and this %d" 20)
>
> Or:
>
>      (format "This %d and %d" 10 20 " and this %d" 30)
>
> Or:
>
>      (format "This %d and %d and %d" 10 20 30)

Although that would work, it's an incompatible change to documented 
behavior. The manual currently says that excess arguments are ignored, 
which means that currently all three expressions have well-defined (and 
differing) behaviors.

A few months ago I changed 'message' in an incompatible way, figuring 
that almost nobody would care. Boy, was I wrong! That being said, I 
agree that the above style is simpler and would be easy to implement, 
and I can do it that way if you prefer.