diff --git a/CMakeLists.txt b/CMakeLists.txt
index 259c3f03..25d8cd0d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -77,6 +77,20 @@ xo_add_genfacetimpl(
 
 # ----------------------------------------------------------------
 
+# note: manual target; generated code committed to git
+xo_add_genfacetimpl(
+    TARGET xo-interpreter2-facetimpl-procedure-closure
+    FACET_PKG xo_procedure2
+    FACET Printable
+    REPR DClosure
+    INPUT idl/IProcedure_DClosure.json5
+    OUTPUT_HPP_DIR include/xo/interpreter2
+    OUTPUT_IMPL_SUBDIR detail
+    OUTPUT_CPP_DIR src/interpreter2
+)
+
+# ----------------------------------------------------------------
+
 xo_add_genfacet_all(xo-interpreter2-genfacet-all)
 
 # ----------------------------------------------------------------
diff --git a/idl/IProcedure_DClosure.json5 b/idl/IProcedure_DClosure.json5
new file mode 100644
index 00000000..d503f5c6
--- /dev/null
+++ b/idl/IProcedure_DClosure.json5
@@ -0,0 +1,17 @@
+{
+    mode: "implementation",
+    includes: [
+        "<xo/procedure2/RuntimeContext.hpp>",
+        "<xo/procedure2/detail/IRuntimeContext_Xfer.hpp>",
+        "<xo/procedure2/Procedure.hpp>",
+        "<xo/procedure2/detail/IProcedure_Xfer.hpp>",
+    ],
+    local_types: [ ],
+    namespace1: "xo",
+    namespace2: "scm",
+    facet_idl: "idl/Procedure.json5",
+    brief: "provide AProcedure interface for DClosure",
+    using_doxygen: true,
+    repr: "DClosure",
+    doc: [ "implement AProcedure for DClosure" ],
+}
diff --git a/include/xo/interpreter2/Closure.hpp b/include/xo/interpreter2/Closure.hpp
new file mode 100644
index 00000000..f352e7f0
--- /dev/null
+++ b/include/xo/interpreter2/Closure.hpp
@@ -0,0 +1,11 @@
+/** @file Closure.hpp
+ *
+ *  @author Roland Conybeare, Feb 2026
+ **/
+
+#pragma once
+
+#include "DClosure.hpp"
+#include "detail/IProcedure_DClosure.hpp"
+
+/* end Closure.hpp */
diff --git a/include/xo/interpreter2/DClosure.hpp b/include/xo/interpreter2/DClosure.hpp
index 09966038..bcf85c97 100644
--- a/include/xo/interpreter2/DClosure.hpp
+++ b/include/xo/interpreter2/DClosure.hpp
@@ -3,8 +3,11 @@
  *  @author Roland Conybeare, Feb 2026
  **/
 
+#pragma once
+
 #include "LocalEnv.hpp"
 #include <xo/expression2/LambdaExpr.hpp>
+#include <xo/procedure2/RuntimeContext.hpp>
 
 namespace xo {
     namespace scm {
@@ -15,7 +18,10 @@ namespace xo {
          **/
         class DClosure {
         public:
+            using ARuntimeContext = xo::scm::ARuntimeContext;
             using AAllocator = xo::mm::AAllocator;
+            using AGCObject = xo::mm::AGCObject;
+            using ppindentinfo = xo::print::ppindentinfo;
             using size_type = std::int32_t;
 
         public:
@@ -29,11 +35,35 @@ namespace xo {
                                    const DLambdaExpr * lm,
                                    const DLocalEnv * env);
 
+            /** @defgroup scm-closure-general-methods **/
+            ///@{
+
+            const DLambdaExpr * lambda() const noexcept { return lambda_; }
+            const DLocalEnv * env() const noexcept { return env_; }
+
+            ///@}
+            /** @defgroup scm-closure-procedure-facet **/
+            ///@{
+
             /** for now, support just fixed-arity procedures **/
             bool is_nary() const noexcept { return false; }
             /** number of arguments expected by this procedure (-1 if nary) **/
             size_type n_args() const noexcept { return lambda_->n_args(); }
 
+            obj<AGCObject> apply_nocheck(obj<ARuntimeContext> rcx, const DArray * args);
+
+            ///@}
+            /** @defgroup scm-closure-gcobject-facet **/
+            ///@{
+
+            ///@}
+            /** @defgroup scm-closure-printable-facet **/
+            ///@{
+
+            bool pretty(const ppindentinfo & ppii) const;
+
+            ///@}
+
         private:
             /** lambda expression **/
             const DLambdaExpr * lambda_ = nullptr;
diff --git a/include/xo/interpreter2/detail/IProcedure_DClosure.hpp b/include/xo/interpreter2/detail/IProcedure_DClosure.hpp
new file mode 100644
index 00000000..2c966a50
--- /dev/null
+++ b/include/xo/interpreter2/detail/IProcedure_DClosure.hpp
@@ -0,0 +1,67 @@
+/** @file IProcedure_DClosure.hpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IProcedure_DClosure.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_repr.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IProcedure_DClosure.json5]
+ **/
+
+#pragma once
+
+#include "Procedure.hpp"
+#include <xo/procedure2/RuntimeContext.hpp>
+#include <xo/procedure2/detail/IRuntimeContext_Xfer.hpp>
+#include <xo/procedure2/Procedure.hpp>
+#include <xo/procedure2/detail/IProcedure_Xfer.hpp>
+#include "DClosure.hpp"
+
+namespace xo { namespace scm { class IProcedure_DClosure; } }
+
+namespace xo {
+    namespace facet {
+        template <>
+        struct FacetImplementation<xo::scm::AProcedure,
+                                   xo::scm::DClosure>
+        {
+            using ImplType = xo::scm::IProcedure_Xfer
+              <xo::scm::DClosure,
+               xo::scm::IProcedure_DClosure>;
+        };
+    }
+}
+
+namespace xo {
+    namespace scm {
+        /** @class IProcedure_DClosure
+         **/
+        class IProcedure_DClosure {
+        public:
+            /** @defgroup scm-procedure-dclosure-type-traits **/
+            ///@{
+            using AGCObject = xo::scm::AProcedure::AGCObject;
+            using Copaque = xo::scm::AProcedure::Copaque;
+            using Opaque = xo::scm::AProcedure::Opaque;
+            ///@}
+            /** @defgroup scm-procedure-dclosure-methods **/
+            ///@{
+            // const methods
+            /** true iff procedure takes n arguments **/
+            static bool is_nary(const DClosure & self) noexcept;
+            /** number of arguments. -1 for n-ary **/
+            static std::int32_t n_args(const DClosure & self) noexcept;
+
+            // non-const methods
+            /** invoke procedure; assume arguments satisfy type system **/
+            static obj<AGCObject> apply_nocheck(DClosure & self, obj<ARuntimeContext> rcx, const DArray * args);
+            ///@}
+        };
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end */
\ No newline at end of file
diff --git a/src/interpreter2/CMakeLists.txt b/src/interpreter2/CMakeLists.txt
index e0903be8..b47ea31d 100644
--- a/src/interpreter2/CMakeLists.txt
+++ b/src/interpreter2/CMakeLists.txt
@@ -16,6 +16,8 @@ set(SELF_SRCS
     IGCObject_DVsmApplyFrame.cpp
     IPrintable_DVsmApplyFrame.cpp
 
+    IProcedure_DClosure.cpp
+
     VsmInstr.cpp
 
     DClosure.cpp
diff --git a/src/interpreter2/DClosure.cpp b/src/interpreter2/DClosure.cpp
index 6d9bc446..1057a25d 100644
--- a/src/interpreter2/DClosure.cpp
+++ b/src/interpreter2/DClosure.cpp
@@ -6,6 +6,8 @@
 #include "DClosure.hpp"
 
 namespace xo {
+    using xo::mm::AGCObject;
+
     namespace scm {
 
         DClosure::DClosure(const DLambdaExpr * lm,
@@ -23,6 +25,16 @@ namespace xo {
             return new (mem) DClosure(lm, env);
         }
 
+        obj<AGCObject>
+        DClosure::apply_nocheck(obj<ARuntimeContext> rcx,
+                                const DArray * args)
+        {
+            (void)rcx;
+            (void)args;
+
+            assert(false);
+        }
+
     } /*namespace scm*/
 } /*namespace xo*/
 
diff --git a/src/interpreter2/IProcedure_DClosure.cpp b/src/interpreter2/IProcedure_DClosure.cpp
new file mode 100644
index 00000000..b41c7be1
--- /dev/null
+++ b/src/interpreter2/IProcedure_DClosure.cpp
@@ -0,0 +1,39 @@
+/** @file IProcedure_DClosure.cpp
+ *
+ *  Generated automagically from ingredients:
+ *  1. code generator:
+ *       [xo-facet/codegen/genfacet]
+ *     arguments:
+ *       --input [idl/IProcedure_DClosure.json5]
+ *  2. jinja2 template for abstract facet .hpp file:
+ *       [iface_facet_any.hpp.j2]
+ *  3. idl for facet methods
+ *       [idl/IProcedure_DClosure.json5]
+**/
+
+#include "detail/IProcedure_DClosure.hpp"
+
+namespace xo {
+    namespace scm {
+        auto
+        IProcedure_DClosure::is_nary(const DClosure & self) noexcept -> bool
+        {
+            return self.is_nary();
+        }
+
+        auto
+        IProcedure_DClosure::n_args(const DClosure & self) noexcept -> std::int32_t
+        {
+            return self.n_args();
+        }
+
+        auto
+        IProcedure_DClosure::apply_nocheck(DClosure & self, obj<ARuntimeContext> rcx, const DArray * args) -> obj<AGCObject>
+        {
+            return self.apply_nocheck(rcx, args);
+        }
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end IProcedure_DClosure.cpp */
diff --git a/src/interpreter2/interpreter2_register_facets.cpp b/src/interpreter2/interpreter2_register_facets.cpp
index b16d33ef..820dac2c 100644
--- a/src/interpreter2/interpreter2_register_facets.cpp
+++ b/src/interpreter2/interpreter2_register_facets.cpp
@@ -8,6 +8,8 @@
 #include "VsmApplyFrame.hpp"
 #include "VsmEvalArgsFrame.hpp"
 
+#include "Closure.hpp"
+
 #include <xo/printable2/detail/APrintable.hpp>
 #include <xo/facet/FacetRegistry.hpp>
 #include <xo/reflectutil/typeseq.hpp>
@@ -36,8 +38,15 @@ namespace xo {
             FacetRegistry::register_impl<AGCObject, DVsmEvalArgsFrame>();
             FacetRegistry::register_impl<APrintable, DVsmEvalArgsFrame>();
 
+            // Procedure
+            // +- Primitive_gco_2_gco_gco
+            // \- Closure
+
+            FacetRegistry::register_impl<AProcedure, DClosure>();
+
             log && log(xtag("DVsmApplyFrame.tseq", typeseq::id<DVsmApplyFrame>()));
             log && log(xtag("DVsmEvalArgsFrame.tseq", typeseq::id<DVsmEvalArgsFrame>()));
+            log && log(xtag("DClosure.tseq", typeseq::id<DClosure>()));
 
             return true;
         }
diff --git a/utest/VirtualSchematikaMachine.test.cpp b/utest/VirtualSchematikaMachine.test.cpp
index 32cf7cab..90805af7 100644
--- a/utest/VirtualSchematikaMachine.test.cpp
+++ b/utest/VirtualSchematikaMachine.test.cpp
@@ -186,6 +186,43 @@ namespace xo {
             vsm.visit_pools(visitor);
         }
 
+        TEST_CASE("VirtualSchematikaMachine-lambda1", "[interpreter2][VSM]")
+        {
+            scope log(XO_DEBUG(true));
+
+            VsmConfig cfg;
+            VirtualSchematikaMachine vsm(cfg);
+
+            bool eof_flag = false;
+
+            vsm.begin_interactive_session();
+            VsmResultExt res = vsm.read_eval_print(span_type::from_cstr("lambda (x : i64) -> i64 { x * x; };"), eof_flag);
+
+            REQUIRE(res.is_value());
+            REQUIRE(res.value());
+
+            log && log(xtag("res.tseq", res.value()->_typeseq()));
+
+            auto x = obj<AGCObject,DFloat>::from(*res.value());
+
+            REQUIRE(x);
+            REQUIRE(x.data()->value() == 1.570796325);
+
+            REQUIRE(res.remaining_.size() == 1);
+            REQUIRE(*res.remaining_.lo() == '\n');
+
+            auto visitor = [&log](const MemorySizeInfo & info) {
+                log && log(xtag("resource", info.resource_name_),
+                           xtag("used", info.used_),
+                           xtag("alloc", info.allocated_),
+                           xtag("commit", info.committed_),
+                           xtag("resv", info.reserved_));
+            };
+
+            FacetRegistry::instance().visit_pools(visitor);
+            vsm.visit_pools(visitor);
+        }
+
     } /*namespace ut*/
 } /*namespace xo*/