entered unreachable code: Could not resolve xproto Error

[unisgn]

xcb: v1.1.1

in my program, i use the composite, render, shape, xfixes entensions.

without connecting with these extensions, the program occasionally run into:

thread 'main' panicked at 'internal error: entered unreachable code: Could not resolve xproto Error with error_code 143 and first_error 0.

panic is annoying.

but with connecting with these extensions, even worse, the program quickly run into:

thread 'main' panicked at 'internal error: entered unreachable code: Could not match extension event.

how to avoid the panic on unresolved xproto error?

[rtbo]

This is likely a bug in the error resolution code.
Can you please post the output of:

xdpyinfo -queryExtensions | awk '/^number of extensions:/,/^default screen number/'