String Interpolation Compare - DIP1027 and YAIDIP

[Walter Bright]

On 10/20/2023 8:51 PM, Steven Schveighoffer wrote:
> Not even printf works as expected, only writef.
> 
> Try doing printf with a string parameter (not a string literal) with DIP1027.

To use printf with i-strings, it's implicitly necessary to use arguments that 
are compatible with printf. That means const(char)* arguments, not string 
arguments. This is something that should be obvious once how i-string conversion 
to tuples works.

DIP1027 has zero knowledge of `writef` or `printf` or `format`.

--- However ---

Ever since we added printf format checking to the language, I've toyed with the 
idea of going a step further and adjusting the arguments (and formats) of the 
calls to printf to make them work.

For example, a D string argument `s` would be split into two parameters, 
`cast(int)s.length, s.ptr`. The format `%s` would be replaced with `%.*s`. In 
other words, you could do things like:

```
printf("integer %s", 67);
```

would be rewritten as:

```
printf("integer %d", 67);
```

After all, if the format checker can give an error message with the correct 
format specifier, why not just fix it?

However, this would be independent of string interpolation. It's just that the 
two separate initiatives would fit together handsomely when dealing with printf.