delete test for removed kernel function as guard test

Author: jbodah

spec/syntax/kernel_function_spec.rb

@@ -16,12 +16,4 @@
  plug Plug.Parsers, length: 400_000_000
  EOF
  end
-
- it 'kernel function used as a guard' do
- expect(<<~'EOF').to include_elixir_syntax('elixirKeyword', 'length')
- def hello(name) when length(name) > 20 do
- IO.puts "hello #{name}, you big boy"
- end
- EOF
- end
 end