several larger changes came together, bit of cleaning too

- all code must be in functions (which must be in classes).
— changes a fair few tests
— also changes api, as method is not recursive, not passed around
- all state in instance vars in compiler (no accessors)
- class is another such variable, surely more coming
all green again

test/fragments/test_recursive_fibo.rb

@@ -5,24 +5,29 @@ class TestRecursinveFibo < MiniTest::Test
 
   def test_recursive_fibo
     @string_input = <<HERE
-int fib_print(int n)
-  int fib = fibonaccir( n )
-  fib.putint()
-end
-int fibonaccir( int n )
-  if( n <= 1 )
-    return n
-  else
-    int tmp
-    tmp = n - 1
-    int a = fibonaccir( tmp )
-    tmp = n - 2
-    int b = fibonaccir( tmp )
-    return a + b
+class Integer
+  int fib_print(int n)
+    int fib = fibonaccir( n )
+    fib.putint()
+  end
+  int fibonaccir( int n )
+    if( n <= 1 )
+      return n
+    else
+      int tmp
+      tmp = n - 1
+      int a = fibonaccir( tmp )
+      tmp = n - 2
+      int b = fibonaccir( tmp )
+      return a + b
+    end
+  end
+end
+class Object
+  int main()
+    fib_print(10)
   end
 end
-
-fib_print(10)
 HERE
   @expect =  [Virtual::Return ]
   check