set_option fo
           --^ textDocument/completion

set_option format
               --^ textDocument/completion

set_option format.in
                  --^ textDocument/completion

set_option trace.p
                --^ textDocument/completion

set_option trace.pp
                 --^ textDocument/completion

set_option trace.pp.ana
                     --^ textDocument/completion

set_option trace.pp.analyze
                         --^ textDocument/completion