It should be `def self.helper`. This has nothing to do with the missing
`super`.
This passes:
```
RSpec.describe do
def self.helper
context 'another context' do
let(:foo) { super() + 1 }
it 'some test' do
expect(foo).to eq(2)
end
end
end
describe 'something' do
let(:foo) { 1 }
helper
end
end
```
Running your example, there's an error message that gives a hint:
```
`helper` is not available on an example group (e.g. a `describe` or
`context` block). It is only available from within individual examples
(e.g. `it` blocks)
```
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