trying to merge a `let` from included context

test.rb

require 'rspec'

shared_context 'test' do
  let(:something) {['something']}
end

describe 'something' do
  include_context 'test'
  let(:something) { super().merge(['another']) }

  it 'should merge something' do
    something.should == ['something', 'another']
  end
end

leads to:

something
  should merge something (FAILED - 1)

Failures:

  1) something should merge something
     Failure/Error: let(:something) { super().merge(['another']) }
     NoMethodError:
       super: no superclass method `something' for #<RSpec::Core::ExampleGroup::Nested_1:0x0000000242e0f8>
     # ./test.rb:9:in `block (2 levels) in <top (required)>'
     # ./test.rb:12:in `block (2 levels) in <top (required)>'

Finished in 0.00046 seconds
1 example, 1 failure

Failed examples:

rspec ./test.rb:11 # something should merge something