support rust-analyzer

[quanlou]

When I use rust-analyzer instead of rls, the

:call LanguageClient#textDocument_definition()

will result

[LC] Definition links are not supported!

But the rust-analyzer actually is supporting go to definition feature

[ngortheone]

I have this issue with latest rust-analyzer and language client.
Do I need to do some special configuration?

My config is:

let g:LanguageClient_serverCommands = {
   \ 'rust': ['~/.cargo/bin/ra_lsp_server'],
   \ 'python': ['~/.local/bin/pyls'],
   \ }