fixed some tests

tests/accept/run/titer6.nim

@@ -6,32 +6,32 @@ discard """
 
 import strutils
 
-iterator tokenize2(s: string, seps: set[char] = Whitespace): tuple[
-  token: string, isSep: bool] =
-  var i = 0
-  while i < s.len:
-    var j = i
-    if s[j] in seps:
+iterator tokenize2(s: string, seps: set[char] = Whitespace): tuple[
+  token: string, isSep: bool] =
+  var i = 0
+  while i < s.len:
+    var j = i
+    if s[j] in seps:
       while j < s.len and s[j] in seps: inc(j)
-      if j > i:
-        yield (copy(s, i, j-1), true)
+      if j > i:
+        yield (substr(s, i, j-1), true)
     else:
       while j < s.len and s[j] notin seps: inc(j)
-      if j > i:
-        yield (copy(s, i, j-1), false)
+      if j > i:
+        yield (substr(s, i, j-1), false)
     i = j
 
 for word, isSep in tokenize2("ta da", whiteSpace):
   var titer2TestVar = 0 
-  stdout.write(titer2TestVar)
+  stdout.write(titer2TestVar)
 
-proc wordWrap2(s: string, maxLineWidth = 80, 
-               splitLongWords = true,
-               seps: set[char] = whitespace,
-               newLine = "\n"): string  = 
-  result = ""
+proc wordWrap2(s: string, maxLineWidth = 80, 
+               splitLongWords = true,
+               seps: set[char] = whitespace,
+               newLine = "\n"): string  = 
+  result = ""
   for word, isSep in tokenize2(s, seps):
-    var w = 0 
+    var w = 0