Warn user incompatible LibFormat library when enabling ClangFormat plugin

In this blog post it is mentioned that enabling the ClangFormat plugin should show certain options, but for me it does not:

It also looks like the ClangFormat plugin is not doing anything, because indentation for structured bindings is still broken (for example), which is supposedly fixed with ClangFormat.

I'm running Arch Linux, which is on Clang 8.0.0 now, which might be the issue?

[bart@samadhi lib]$ lsof -p 2013 | grep clangFormat
clangback 2013 bart  mem       REG                8,2   624336 25468298 /usr/lib/libclangFormat.so.8

The libclangFromat library seems correctly loaded.