" That function requires vim-lsp/autoload/lsp/ui/vim/diagnostics.vim:
" function! lsp#ui#vim#diagnostics#get_all_buffer_diagnostics(...) abort
"     return s:get_all_buffer_diagnostics()
" endfunction

function! mylsp#qfpopulate() abort
    let l = []
    for d in lsp#ui#vim#diagnostics#get_all_buffer_diagnostics()
        call add(l, {
            \"lnum": d["range"]["start"]["line"],
            \"col": d["range"]["start"]["character"],
            \"text": d["message"],
            \"bufnr": bufnr()})
    endfor
    call setqflist(l, "r")
endfunction