duplicated arrow when trailing part of function prototype already comes with one

[oblitum]

echodoc.vim produces strange duplicated arrows if trailing part of function data already comes with a prepending arrow:

This happens when using ccls instead of clangd due to a hard-coded arrow at

echodoc.vim/autoload/echodoc/default.vim

Line 69 in bebe553

call add(ret, {'text': ' -> '.v_comp.trailing})

.

[oblitum]

@Shougo, c568323 forgets to add a default value for g:echodoc#highlight_trailing:

Error detected while processing function <SNR>53__on_cursor_moved[36]..7:
line   54:
E121: Undefined variable: g:echodoc#highlight_trailing

I think you did a typo,

let g:echodoc#highlight_type = get(g:,
      \ 'echodoc#highlight_type', 'Type')

should have been:

let g:echodoc#highlight_trailing = get(g:,
      \ 'echodoc#highlight_trailing', 'Type')

[Shougo]

I have fixed the typo.