wrap with rts

src/main/scala/com/htmlism/mos6502/dsl/syntax/AsmSyntax.scala

@@ -14,6 +14,8 @@ trait AsmSyntax {
 
     f(ctx)
 
+    ctx.push(RTS)
+
     Subroutine(s, ctx.toFragment, ctx.getJumps)
   }
 

src/test/scala/com/htmlism/mos6502/dsl/Easy6502Spec.scala

@@ -67,9 +67,20 @@ class Easy6502Spec extends AnyFlatSpec with should.Matchers {
   }
 
   "snake" should "compile" in {
+    val initSnake =
+      sub("initSnake") { implicit a =>
+        registers.X.incr
+      }
+
+    val generateApplePosition =
+      sub("generateApplePosition") { implicit a =>
+        registers.X.incr
+      }
+
     val init =
       sub("init") { implicit a =>
-        registers.X.incr
+        jump(initSnake)
+        jump(generateApplePosition)
       }
 
     val readKeys =