-O flag ; automatic cast in a bitshift

[Vladimir Panteleev]

On Thursday, 20 September 2018 at 11:14:05 UTC, Guillaume Lathoud 
wrote:
> Thanks!

FYI, it's undefined in D mainly because the behavior of the 
actual Intel CPU instruction is undefined in such cases:

https://c9x.me/x86/html/file_module_x86_id_285.html

"it is undefined for SHL and SHR instructions where the count is 
greater than or equal to the size (in bits) of the destination 
operand".