Observe:

user=> (defn count-sequence  [& seq]
  (match [seq]
;   [([so-far [x & xs]] :seq)] (str "1:" so-far x xs)
   [([[& sequence]] :seq)] (str "2:" sequence)))
user=> (count-sequence [1 2 3])
"2:[1 2 3]"

Now uncomment the commented line:

user=> (defn count-sequence  [& seq]
  (match [seq]
   [([so-far [x & xs]] :seq)] (str "1:" so-far x xs)
   [([[& sequence]] :seq)] (str "2:" sequence)))
user=> (count-sequence [1 2 3])
nil

This is a bug? Please?

(Note: the same thing happens without a &rest argument if you pass in [[1 2 3]])

-----
Brian Marick, Artisanal Labrador
Contract programming in Ruby and Clojure
Occasional consulting on Agile


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