diff --git a/include/cpp/jank/prelude.hpp b/include/cpp/jank/prelude.hpp
index cf24402e2..826880123 100644
--- a/include/cpp/jank/prelude.hpp
+++ b/include/cpp/jank/prelude.hpp
@@ -28,4 +28,5 @@
 #include <jank/runtime/behavior/numberable.hpp>
 #include <jank/runtime/behavior/nameable.hpp>
 #include <jank/runtime/behavior/transientable.hpp>
+#include <jank/runtime/behavior/consable.hpp>
 #include <jank/runtime/behavior/associatively_writable.hpp>
diff --git a/include/cpp/jank/runtime/behavior/associatively_writable.hpp b/include/cpp/jank/runtime/behavior/associatively_writable.hpp
index b0099eaa6..4dd9a1b12 100644
--- a/include/cpp/jank/runtime/behavior/associatively_writable.hpp
+++ b/include/cpp/jank/runtime/behavior/associatively_writable.hpp
@@ -14,7 +14,11 @@ namespace jank::runtime::behavior
   template <typename T>
   concept associatively_writable_in_place = requires(T * const t) {
     {
-      t->assoc_in_place(object_ptr{}, object_ptr{}), t->dissoc_in_place(object_ptr{})
+      t->assoc_in_place(object_ptr{}, object_ptr{})
+    } -> std::convertible_to<object_ptr>;
+
+    {
+      t->dissoc_in_place(object_ptr{})
     } -> std::convertible_to<object_ptr>;
   };
 }
diff --git a/include/cpp/jank/runtime/obj/transient_vector.hpp b/include/cpp/jank/runtime/obj/transient_vector.hpp
index efe9e70c5..11632bdb1 100644
--- a/include/cpp/jank/runtime/obj/transient_vector.hpp
+++ b/include/cpp/jank/runtime/obj/transient_vector.hpp
@@ -23,8 +23,6 @@ namespace jank::runtime
       return ret;
     }
 
-    native_box<static_object> pop_in_place();
-
     /* behavior::objectable */
     native_bool equal(object const &) const;
     native_persistent_string to_string() const;
@@ -49,6 +47,8 @@ namespace jank::runtime
     object_ptr get_entry(object_ptr const idx) const;
     native_bool contains(object_ptr const elem) const;
 
+    native_box<static_object> pop_in_place();
+
     void assert_active() const;
 
     object base{ object_type::transient_vector };
diff --git a/src/cpp/jank/runtime/obj/transient_vector.cpp b/src/cpp/jank/runtime/obj/transient_vector.cpp
index 0d312acbf..86cb302e1 100644
--- a/src/cpp/jank/runtime/obj/transient_vector.cpp
+++ b/src/cpp/jank/runtime/obj/transient_vector.cpp
@@ -40,16 +40,6 @@ namespace jank::runtime
     return static_cast<native_hash>(reinterpret_cast<uintptr_t>(this));
   }
 
-  obj::transient_vector_ptr obj::transient_vector::pop_in_place()
-  {
-    assert_active();
-    if(data.empty())
-    { throw std::runtime_error{ "Can't pop empty vector" }; }
-
-    data.take(data.size() - 1);
-    return this;
-  }
-
   size_t obj::transient_vector::count() const
   {
     assert_active();
@@ -164,6 +154,18 @@ namespace jank::runtime
     }
   }
 
+  obj::transient_vector_ptr obj::transient_vector::pop_in_place()
+  {
+    assert_active();
+    if(data.empty())
+    {
+      throw std::runtime_error{ "Can't pop empty vector" };
+    }
+
+    data.take(data.size() - 1);
+    return this;
+  }
+
   void obj::transient_vector::assert_active() const
   {
     if(!active)
diff --git a/src/jank/clojure/core.jank b/src/jank/clojure/core.jank
index 1e9035dd7..f12c5216e 100644
--- a/src/jank/clojure/core.jank
+++ b/src/jank/clojure/core.jank
@@ -408,9 +408,9 @@
                    if constexpr(behavior::transientable<T>)
                    { return typed_o->to_transient(); }
                    else
-                   { throw #{ (ex-info :not-transientable {:o o}) }#; }
+                   { throw ~{ (ex-info :not-transientable {:o o}) }; }
                  },
-                 #{ o }#
+                 ~{ o }
                );"))
 
 ; Returns a new, persistent version of the transient collection, in
@@ -426,9 +426,9 @@
                    if constexpr(behavior::persistentable<T>)
                    { return typed_o->to_persistent(); }
                    else
-                   { throw #{ (ex-info :not-persistentable {:o o}) }#; }
+                   { throw ~{ (ex-info :not-persistentable {:o o}) }; }
                  },
-                 #{ o }#
+                 ~{ o }
                );"))
 
 (defn conj!
@@ -439,17 +439,17 @@
   ([coll x]
    (native/raw "__value = visit_object
                 (
-                  [=](auto const typed_t, auto const head) -> object_ptr
+                  [=](auto const typed_coll, auto const head) -> object_ptr
                   {
-                    using T = typename decltype(typed_t)::value_type;
+                    using T = typename decltype(typed_coll)::value_type;
 
-                    if constexpr(behavior::persistentable<T>)
-                    { return typed_t->cons_in_place(head); }
+                    if constexpr(behavior::consable_in_place<T>)
+                    { return typed_coll->cons_in_place(head); }
                     else
-                    { throw #{ (ex-info :not-persistentable {:o coll}) }#; }
+                    { throw ~{ (ex-info :not-persistentable {:o coll}) }; }
                    },
-                   #{ coll }#,
-                   #{ x }#
+                   ~{ coll },
+                   ~{ x }
                  );
                ")))
 
@@ -464,11 +464,11 @@
                     if constexpr(behavior::associatively_writable_in_place<T>)
                     { return typed_t->assoc_in_place(key, val); }
                     else
-                    { throw #{ (ex-info :not-associatively_writable_in_place {:o coll}) }#; }
+                    { throw ~{ (ex-info :not-associatively_writable_in_place {:o coll}) }; }
                   },
-                  #{ coll }#,
-                  #{ k }#,
-                  #{ v }#
+                  ~{ coll },
+                  ~{ k },
+                  ~{ v }
                 );
                "))
   ([coll k v & kvs]
@@ -488,10 +488,10 @@
                     if constexpr(behavior::associatively_writable_in_place<T>)
                     { return typed_t->dissoc_in_place(key); }
                     else
-                    { throw #{ (ex-info :not-associatively_writable_in_place {:o coll}) }#; }
+                    { throw ~{ (ex-info :not-associatively_writable_in_place {:o coll}) }; }
                   },
-                  #{ coll }#,
-                  #{ k }#
+                  ~{ coll },
+                  ~{ k }
                 );
                "))
   ([coll k & ks]
@@ -502,19 +502,13 @@
 
 (defn pop!
   ([coll]
-   (native/raw "__value = visit_object
-                (
-                  [=](auto const typed_t) -> object_ptr
-                  {
-                    using T = typename decltype(typed_t)::value_type;
-
-                    if constexpr(std::same_as<T, obj::transient_vector>)
-                    { return typed_t->pop_in_place(); }
-                    else
-                    { throw #{ (ex-info :not-transient-vector {:o coll}) }#; }
-                  },
-                  #{ coll }#
-                );
+   (native/raw "if( ~{ coll }->type == object_type::transient_vector )
+                {
+                  auto typed_coll = expect_object<obj::transient_vector>(~{ coll });
+                  __value = typed_coll->pop_in_place();
+                }
+                else
+                { throw ~{ (ex-info :not-transient-vector {:o coll}) }; }
                ")))
 
 ; Functions.