Debugger entered--Lisp error: (error "`global' non-zero exit: global: GTAGS not found.")
  signal(error ("`global' non-zero exit: global: GTAGS not found."))
  error("`%s' non-zero exit: %s" "global" "global: GTAGS not found.")
  ggtags-process-string("global" "--ignore-case" "-c" "sys")
  apply(ggtags-process-string "global" ("--ignore-case" "-c" "sys"))
  #f(compiled-function (prefix) #<bytecode 0x40751ea1>)("sys")
  #f(compiled-function (string pred action) #<bytecode 0x40751ec9>)("sys" nil t)
  all-completions("sys" #f(compiled-function (string pred action) #<bytecode 0x40751ec9>) nil)
  completion-pcm--all-completions("" ("sys" point) #f(compiled-function (string pred action) #<bytecode 0x40751ec9>) nil)
  completion-basic-all-completions("sys" #f(compiled-function (string pred action) #<bytecode 0x40751ec9>) nil 3)
  #f(compiled-function (style) #<bytecode 0x4088a97f>)(basic)
  completion--some(#f(compiled-function (style) #<bytecode 0x4088a97f>) (basic partial-completion emacs22))
  completion--nth-completion(2 "sys" #f(compiled-function (string pred action) #<bytecode 0x40751ec9>) nil 3 nil)
  completion-all-completions("sys" #f(compiled-function (string pred action) #<bytecode 0x40751ec9>) nil 3)
  company-capf(candidates "sys")
  apply(company-capf (candidates "sys"))
  company-call-backend-raw(candidates "sys")
  apply(company-call-backend-raw (candidates "sys"))
  company--force-sync(company-call-backend-raw (candidates "sys") company-capf)
  company-call-backend(candidates "sys")
  company--fetch-candidates("sys")
  company-calculate-candidates("sys" nil)
  company--begin-new()
  company--perform()
  company-auto-begin()
  company-manual-begin()
  my-company-lighter-current-length()
  eval((my-company-lighter-current-length))
  redisplay_internal\ \(C\ function\)()

This reverts commit d9f557987d.