Execute(The crystal handler should parse lines correctly and add the column if it can):
  runtime ale_linters/crystal/crystal.vim
  AssertEqual
  \ [
  \   {
  \     'lnum': 2,
  \     'bufnr': 255,
  \     'col': 1,
  \     'type': 'E',
  \     'text': 'unexpected token: EOF'
  \   }
  \ ],
  \ ale_linters#crystal#crystal#Handle(255, [
  \ '[{"file":"/tmp/test.cr","line":2,"column":1,"size":null,"message":"unexpected token: EOF"}]'
  \ ])

After:
  call ale#linter#Reset()