This pragma sets the diagnostic messages that have the specified tags to Error severity. Diagnostic messages are messages whose message numbers are postfixed by -D, for example, #550-D.
Syntax
#pragma diag_error tag[,tag,...]
Where:
tag[,tag,...]
is a comma-separated list of diagnostic message numbers specifying the messages whose severities are to be changed.
At least one diagnostic message number must be specified.