https://www.digitalmars.com/ctg/ctgLanguageImplementation.ht...
case 0b0001'0000:
case 0b0101'1000:
(edit, fixed formatting, but I also wanted to agree with a lower down comment asking for 0b001_0000 instead; a better choice.)
case 0b0001_0000: case 0b0101_1000:
P.S. I copied this feature from 1983 Ada. AFAIK, it was a completely forgotten feature until D had it, then other languages started copying D.
https://www.digitalmars.com/ctg/ctgLanguageImplementation.ht...