Implements error, warning, deprecation, message, and
tip. Report a diagnostic error, taking a va_list parameter, and
optionally additional message prefixes. Whether the message gets printed
depends on runtime values of DiagnosticReporting and global gagging.
Implements error, warning, deprecation, message, and tip. Report a diagnostic error, taking a va_list parameter, and optionally additional message prefixes. Whether the message gets printed depends on runtime values of DiagnosticReporting and global gagging.