test-f.clj

user=> (defn test-f "doc" [x] x)
#'user/test-f
user=> (meta test-f)            
{:ns #<Namespace user>, :name test-f}
user=> (meta test-f)
{:ns #<Namespace user>, :name test-f}
user=> (defn test-f "doc" [x] x)
#'user/test-f
user=> (meta test-f)            
{:ns #<Namespace user>, :name test-f, :file "NO_SOURCE_PATH", :line 6, :arglists ([x]), :doc "doc"}

;; Now, change some metadata... docstring!
user=> (defn test-f "totally new docstring!" [x] x)
#'user/test-f
user=> (meta test-f)                               
{:ns #<Namespace user>, :name test-f, :file "NO_SOURCE_PATH", :line 9, :arglists ([x]), :doc "doc"}
user=> (meta test-f)
{:ns #<Namespace user>, :name test-f, :file "NO_SOURCE_PATH", :line 9, :arglists ([x]), :doc "doc"}
user=> (defn test-f "totally new docstring!" [x] x)
#'user/test-f
user=> (meta test-f)                               
{:ns #<Namespace user>, :name test-f, :file "NO_SOURCE_PATH", :line 11, :arglists ([x]), :doc "totally new docstring!"}