New integer promotion rules

[ag0aep6g]

On 01/17/2018 08:40 PM, rumbu wrote:
> This started in the last DMD version (2.078):
> 
> byte b = -10;
> ulong u = b < 0 ? -b : b;
> 
> //Deprecation: integral promotion not done for `-b`, use 
> '-transition=intpromote' switch or `-cast(int)(b)
> 
> Why do I need a to promote a byte to int to obtain an ulong? Even in the 
> extreme case where b is byte.min, -byte.min as unsigned is exactly what 
> i need: 128;

Actually, for b = byte.min, you get u = 18446744073709551488.

2.078 is starting to fix this so that you get 128. But that's a breaking 
change, so you have to use the compiler switch or the cast for a couple 
releases.

In the changelog: https://dlang.org/changelog/2.078.0.html#fix16997