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_functions.rb

@@ -5,30 +5,35 @@ class TestFunctions < MiniTest::Test
 
   def test_functions
     @string_input = <<HERE
-int minus(int a,int b)
-    return a - b
-end
+class Object
 
-int plus(int a, int b)
-  return a + b
-end
+  int minus(int a,int b)
+      return a - b
+  end
 
-int times(int a, int b)
-  if( b == 0 )
-    a = 0
-  else
-    int m = minus(b, 1)
-    int t = times(a, m)
-    a = plus(a,t)
+  int plus(int a, int b)
+    return a + b
+  end
+
+  int times(int a, int b)
+    if( b == 0 )
+      a = 0
+    else
+      int m = minus(b, 1)
+      int t = times(a, m)
+      a = plus(a,t)
+    end
+  end
+
+  int t_seven()
+    int tim = times(7,6)
+    tim.putint()
+  end
+
+  int main()
+    t_seven()
   end
 end
-
-int t_seven()
-  int tim = times(7,6)
-  tim.putint()
-end
-
-t_seven()
 HERE
   @expect =  [Virtual::Return ]
   check