xcb_connect() always returns a non-NULL pointer

[Radvendii]

I am very new to xcb, so I don't really know what I'm talking about. But in the xcb.h header file, the documentation for xcb_connect() says

 * Always returns a non-NULL pointer to a xcb_connection_t, even on failure.
 * Callers need to use xcb_connection_has_error() to check for failure.

In conn.zig, we have connect() checking for null values, but xcb_connection_has_error() is nowhere to be seen. Am I missing something?