https://issues.dlang.org/show_bug.cgi?id=2617
--- Comment #8 from Walter Bright <bugzi...@digitalmars.com> --- Looking at my ancient Intel 8088 manual, it says: INC [BX] is ambiguous and so must use BYTE PTR or WORD PTR. Since the behavior of iasm is modeled after Intel's syntax, that pretty much settles it. --