diff --git a/core/module.c b/core/module.c
index 4b20e25..fd953e8 100644
--- a/core/module.c
+++ b/core/module.c
@@ -4967,10 +4967,20 @@ static __attribute__((noinline, aligned(64))) PureResult run_batches(const PureM
     return finish(&frame, how, result);
 }
 
+#ifdef PURE_NATIVE_INC /* research 045: the executor's steps stitched for one module */
+#include PURE_NATIVE_INC
+#endif
+
 /* At a cache line's start: the steps' branches land where they would (research 126: else 10% more cycles, as many instructions). */
 static __attribute__((aligned(64))) PureResult run(const PureModule *m, PureValue *values, PureBlock block, Event *ev, Slot *result) {
     PureCompiled code = m->jit ? pure_jit_code(m->jit, block) : NULL;
     if (code) return run_compiled(code, m, values, block, ev, result);
+#ifdef PURE_NATIVE_INC
+    static const PureModule *native_seen;
+    static bool native_ok;
+    if (m != native_seen) native_seen = m, native_ok = native_matches(m) && getenv("PURE_NATIVE");
+    if (native_ok && m->runner == 2) return run_native(m, values, block, ev, result);
+#endif
     if (m->runner) return m->runner == 2 ? run_calls(m, values, block, ev, result) : run_batches(m, values, block, ev, result);
     Slot stack[PURE_MODULE_STACK];
     Loop loops[PURE_MODULE_NESTING];