Add a test for the msgsuffix char(8) hack.

tests/test.cmp

@@ -5921,15 +5921,35 @@ Explicit delta should be seen - don't count OMITS
 REM 18 Feb +0 MSG Explicit delta should not be seen.
 ../tests/test.rem(1170): Trig = Monday, 18 February, 1991
 
+# Test msgsuffix
+FSET msgsuffix(x) "On the next line"
+REM MSG Hello
+../tests/test.rem(1174): Trig = Saturday, 16 February, 1991
+Entering UserFN msgsuffix(5000)
+Leaving UserFN msgsuffix(5000) => "On the next line"
+Hello
+On the next line
+
+FSET msgsuffix(x) char(8) + " on the same line"
+../tests/test.rem(1176): Function msgsuffix redefined (previously defined at ../tests/test.rem:1173)
+REM MSG Hello
+../tests/test.rem(1177): Trig = Saturday, 16 February, 1991
+Entering UserFN msgsuffix(5000)
+char(8) => "\b"
+"\b" + " on the same line" => "\b on the same line"
+Leaving UserFN msgsuffix(5000) => "\b on the same line"
+Hello on the same line
+
+
 # Output expression-node stats
 DEBUG +s
 # Don't want Remind to queue reminders
 EXIT
   Var hash: total = 141; maxlen = 4; avglen = 2.104
- Func hash: total = 16; maxlen = 2; avglen = 0.516
+ Func hash: total = 17; maxlen = 2; avglen = 0.548
 Dedup hash: total = 0; maxlen = 0; avglen = 0.000
  Expression nodes allocated: 128
-Expression nodes high-water: 73
+Expression nodes high-water: 74
     Expression nodes leaked: 0
      Parse level high-water: 25
 

tests/test.rem

@@ -1169,6 +1169,13 @@ REM 18 Feb ++0 MSG Explicit delta should not be seen.
 REM 18 Feb +1 MSG Explicit delta should be seen - don't count OMITS
 REM 18 Feb +0 MSG Explicit delta should not be seen.
 
+# Test msgsuffix
+FSET msgsuffix(x) "On the next line"
+REM MSG Hello
+
+FSET msgsuffix(x) char(8) + " on the same line"
+REM MSG Hello
+
 # Output expression-node stats
 DEBUG +s
 # Don't want Remind to queue reminders