I'm looking to better understand how nested cats work (now that just sounds
funny).
I've found that sometimes spec/cat will generate a nested list:
```clojure
(gen/sample (s/gen (s/cat :start #{\a}
:content (s/cat :nothing (s/? #{\^})
:fruit (s/or
:apples (s/+ (s/cat :skin #{\s}
:flesh #{\f}
:core #{\c}))
:bananas (s/+ #{\b})))
:end #{\z})) 5)
```
-> ((\a \^ (\s \f \c) \z) ... (\a \^ (\b \b) \z))
Given the sample output we can assume this validate call will be false
(provided flat list):
```clojure
(s/valid? (s/cat :start #{\a}
:content (s/cat :nothing (s/? #{\^})
:fruit (s/or :apples (s/+
(s/cat :skin #{\s}
:flesh #{\f}
:core #{\c}))
:bananas (s/+
#{\b})))
:end #{\z}) [\a \^ \s \f \c \z])
```
-> false
I thought the s/spec function would need to be used to define nested
structures (s/spec (s/cat ...)).
Is this expected behavior or is there a better approach for working with
flat lists?
Thanks!
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