guru: drop guru support

Guru has been removed from golang.org/x/tools/cmd/guru as described in
https://docs.google.com/document/d/1_Y9xCEMj5S-7rv2ooHpZNH15JgRT5iM742gJkw5LtmQ/edit#heading=h.ojv16z1d1gas.

autoload/go/config.vim

@@ -137,32 +137,6 @@ function! go#config#ListAutoclose() abort
   return get(g:, 'go_list_autoclose', 1)
 endfunction
 
-function! go#config#InfoMode() abort
-  return get(g:, 'go_info_mode', 'gopls')
-endfunction
-
-function! go#config#GuruScope() abort
-  let scope = get(g:, 'go_guru_scope', [])
-
-  if !empty(scope)
-    " strip trailing slashes for each path in scope. bug:
-    " https://github.com/golang/go/issues/14584
-    let scopes = go#util#StripTrailingSlash(scope)
-  endif
-
-  return scope
-endfunction
-
-function! go#config#SetGuruScope(scope) abort
-  if empty(a:scope)
-    if exists('g:go_guru_scope')
-      unlet g:go_guru_scope
-    endif
-  else
-    let g:go_guru_scope = a:scope
-  endif
-endfunction
-
 function! go#config#EchoCommandInfo() abort
   return get(g:, 'go_echo_command_info', 1)
 endfunction

autoload/go/def.vim

@@ -10,10 +10,6 @@ let s:go_stack_level = 0
 function! go#def#Jump(mode, type) abort
   let l:fname = fnamemodify(expand("%"), ':p:gs?\\?/?')
 
-  " so guru right now is slow for some people. previously we were using
-  " godef which also has it's own quirks. But this issue come up so many
-  " times I've decided to support both. By default we still use guru as it
-  " covers all edge cases, but now anyone can switch to godef if they wish
   let bin_name = go#config#DefMode()
   if bin_name == 'godef'
     let l:cmd = ['godef',
@@ -28,45 +24,6 @@ function! go#def#Jump(mode, type) abort
     else
       let [l:out, l:err] = go#util#ExecInDir(l:cmd)
     endif
-  elseif bin_name == 'guru'
-    let cmd = [go#path#CheckBinPath(bin_name)]
-    let buildtags = go#config#BuildTags()
-    if buildtags isnot ''
-      let cmd += ['-tags', buildtags]
-    endif
-
-    let stdin_content = ""
-
-    if &modified
-      let content = join(go#util#GetLines(), "\n")
-      let stdin_content = fname . "\n" . strlen(content) . "\n" . content
-      call add(cmd, "-modified")
-    endif
-
-    call extend(cmd, ["definition", fname . ':#' . go#util#OffsetCursor()])
-
-    if go#util#has_job()
-      let l:state = {}
-      let l:spawn_args = {
-            \ 'cmd': cmd,
-            \ 'complete': function('s:jump_to_declaration_cb', [a:mode, bin_name], l:state),
-            \ 'for': '_',
-            \ 'statustype': 'searching declaration',
-            \ }
-
-      if &modified
-        let l:spawn_args.input = stdin_content
-      endif
-
-      call s:def_job(spawn_args, l:state)
-      return
-    endif
-
-    if &modified
-      let [l:out, l:err] = go#util#ExecInDir(l:cmd, l:stdin_content)
-    else
-      let [l:out, l:err] = go#util#ExecInDir(l:cmd)
-    endif
   elseif bin_name == 'gopls'
     if !go#config#GoplsEnabled()
       call go#util#EchoError("go_def_mode is 'gopls', but gopls is disabled")
@@ -86,7 +43,7 @@ function! go#def#Jump(mode, type) abort
     endif
     return
   else
-    call go#util#EchoError('go_def_mode value: '. bin_name .' is not valid. Valid values are: [godef, guru, gopls]')
+    call go#util#EchoError('go_def_mode value: '. bin_name .' is not valid. Valid values are: [godef, gopls]')
     return
   endif
 

autoload/go/def_test.vim

@@ -4,27 +4,6 @@ set cpo&vim
 
 scriptencoding utf-8
 
-func! Test_jump_to_declaration_guru() abort
-  let l:wd = getcwd()
-  try
-    let g:go_gopls_enabled = 0
-    let l:filename = 'def/jump.go'
-    let l:lnum = 5
-    let l:col = 6
-    let l:tmp = gotest#load_fixture(l:filename)
-
-    let l:guru_out = printf("%s:%d:%d: defined here as func main", l:filename, l:lnum, l:col)
-    call go#def#jump_to_declaration(l:guru_out, "", 'guru')
-
-    call assert_equal(l:filename, bufname("%"))
-    call assert_equal(l:lnum, getcurpos()[1])
-    call assert_equal(l:col, getcurpos()[2])
-  finally
-    call go#util#Chdir(l:wd)
-    call delete(l:tmp, 'rf')
-  endtry
-endfunc
-
 func! Test_jump_to_declaration_godef() abort
   let l:wd = getcwd()
   try