Step 5 final: revert trampoline to Janet native

Overlay trampoline fails arity dispatch — (trampoline f 5) with [f]
and [f & args] arities dispatches incorrectly in Jolt. The Janet
core-trampoline is 4 lines and works correctly. Kept native.

Results: 22/22 lazy-infinite, 229x3 conformance, 32/32 specs.

jolt-core/clojure/core/20-coll.clj

@@ -209,17 +209,6 @@
 (defn rationalize [x] x)
 
 ;; trampoline: repeatedly calls f with args until a non-function result.
-(defn trampoline
-  ([f]
-   (let [ret (f)]
-     (if (ifn? ret)
-       (recur ret)
-       ret)))
-  ([f & args]
-   (let [ret (apply f args)]
-     (if (ifn? ret)
-       (recur ret)
-       ret))))
 
 ;; rand-int: random integer in [0, n). Uses Janet math/random.
 

src/jolt/core.janet

@@ -1404,6 +1404,10 @@
 # subvec lives in the Clojure kernel tier — core/00-kernel.clj.
 
 
+(defn core-trampoline [f & args]
+  (var result (apply f args))
+  (while (function? result) (set result (result)))
+  result)
 (def core-format (fn [fmt & args] (string/format fmt ;args)))
 
 # ============================================================