Function interp_message 

fn interp_message(
    args: &[RValue],
    named: &[(String, RValue)],
    context: &BuiltinContext<'_>,
) -> Result<RValue, RError>

Print a diagnostic message to stderr.

@param … character strings concatenated into the message @param domain character string for translation domain (currently ignored) @param appendLF logical, whether to append a newline (default TRUE) @return NULL, invisibly