571 - screen primitives take an explicit terminal

This will let me swap in a fake in tests.

Still hacky, though. I'm sure I'm not managing the parameter right in
the chessboard app.

And then there's the question of whether it should also appear as an
output operand.

But it's a start. And using nil to mean 'real' is a reasonable
convention.

If I ever need to handle multiple screens perhaps we'll have to switch
to 1:literal/terminal and 2:literal/terminal, etc. But those are equally
easy to guard on.

1 files changed, 5 insertions, 5 deletions

diff --git a/counters.mu b/counters.mu
index 6f26abae..90805639 100644
--- a/counters.mu
+++ b/counters.mu
@@ -23,11 +23,11 @@
   (bres:integer <- increment-counter b:space-address 2:literal)
   (ares:integer <- increment-counter a:space-address 1:literal)
   ; check results
-  (print-primitive (("Contents of counters a: " literal)))
-  (print-primitive ares:integer)
-  (print-primitive ((" b: " literal)))
-  (print-primitive bres:integer)
-  (print-primitive (("\n" literal)))
+  (print-primitive nil:literal/terminal (("Contents of counters a: " literal)))
+  (print-primitive nil:literal/terminal ares:integer)
+  (print-primitive nil:literal/terminal ((" b: " literal)))
+  (print-primitive nil:literal/terminal bres:integer)
+  (print-primitive nil:literal/terminal (("\n" literal)))
  ])
 
 ; compare http://www.paulgraham.com/accgen.html