(fn [x] (:foo/bar x)) disassembled

gistfile1.txt

  public java.lang.Object invoke(java.lang.Object x);
     0  getstatic user$eval3717$fn__3718.__thunk__0__ : clojure.lang.ILookupThunk [37]
     3  dup
     4  aload_1 [x]
     5  aconst_null
     6  astore_1 [x]
     7  dup_x2
     8  invokeinterface clojure.lang.ILookupThunk.get(java.lang.Object) : java.lang.Object [46] [nargs: 2]
    13  dup_x2
    14  if_acmpeq 21
    17  pop
    18  goto 43
    21  swap
    22  pop
    23  dup
    24  getstatic user$eval3717$fn__3718.__site__0__ : clojure.lang.KeywordLookupSite [35]
    27  swap
    28  invokeinterface clojure.lang.ILookupSite.fault(java.lang.Object) : clojure.lang.ILookupThunk [52] [nargs: 2]
    33  dup
    34  putstatic user$eval3717$fn__3718.__thunk__0__ : clojure.lang.ILookupThunk [37]
    37  swap
    38  invokeinterface clojure.lang.ILookupThunk.get(java.lang.Object) : java.lang.Object [46] [nargs: 2]
    43  areturn
      Line numbers:
        [pc: 0, line: 1]
        [pc: 0, line: 1]
      Local variable table:
        [pc: 0, pc: 43] local: this index: 0 type: java.lang.Object
        [pc: 0, pc: 43] local: x index: 1 type: java.lang.Object