4506

check_ints_equal now prints a newline after the failure message on failure.

We still don't know how to print a final newline after all the tests have
run, for the common case when all tests pass.

Ideally I could just emit a few instructions to `run_tests`. But I'd also
need to add a variable for the newline to the data segment. Or I need some
literal syntax for newlines in strings. We don't have support for backslash-escapes
yet.

subx/apps/factorial.subx

@@ -130,6 +130,13 @@ $check_ints_equal:else:
       # call
   e8/call  write_stderr/disp32
       # discard arg
+  81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add 4 to ESP
+    # print newline
+      # push args
+  68/push  Newline/imm32
+      # call
+  e8/call  write_stderr/disp32
+      # discard arg
   81          0/subop/add         3/mod/direct    4/rm32/ESP    .           .             .           .           .               4/imm32           # add 4 to ESP
   # end
   c3/return
@@ -196,6 +203,12 @@ write_stderr:  # s : (address array byte) -> <void>
   c3/return
 
 == data
+Newline:
+  # size
+  01 00 00 00
+  # data
+  0a/newline
+
 Test_argv:  # null-terminated
   # data
   74/t 65/e 73/s 74/t 00/null