Common type of ubyte and const ubyte is int

[Walter Bright]

On 5/3/2024 1:14 PM, matheus wrote:
> Like this D code:
> 
> import std.stdio;
> 
> void main(){
>      char u;
>      const char v;
>      writefln("%d %d", (u.sizeof), (1?u:v).sizeof);
> }
> 
> Prints: "1 1".

You're right.

But change `char` to `ubyte` and you'll get "1 4".

This is because the table in impcnvtab.d does not deal with char types:

https://github.com/dlang/dmd/blob/master/compiler/src/dmd/impcnvtab.d#L165

So, char types do not undergo integral promotion when trying to bring two 
expressions to a common type. Byte, ubyte, short, and ushort do.

This can be debated as to which it should be, but there's a lot of water under 
that bridge.