error diagnostic messages with a severity code of integer or higher, appear in the
assembler listing. Error diagnostic messages with a severity code lesser than
integer do not appear in the listing, and the severity codes associated
with those messages are not used to set the return code issued by the assembler. Any severity code
from 0 through 255 can be specified. Error diagnostic messages have a severity code of 0, 2, 4, 8,
12, 16, or 20. MNOTEs can have a severity code of 0 through 255.
