TEST: convertion unit tests into run tests

backend.native/tests/codegen/branching/if_else.kt

@@ -1,4 +1,8 @@
 fun if_else(b: Boolean): Int {
   if (b) return 42
   else   return 24
+}
+
+fun main(args: Array<String>) {
+  if (if_else(false) != 24) throw Error()
 }