Changed tests and tools to use 'discard' statements instead of 'nil' for empty blocks.

tests/sets/tsets.nim

@@ -1,7 +1,7 @@
-discard """
-  file: "tsets.nim"
-  output: "Ha ein F ist in s!"
-"""
+discard """
+  file: "tsets.nim"
+  output: "Ha ein F ist in s!"
+"""
 # Test the handling of sets
 
 import
@@ -38,7 +38,7 @@ type
   TTokTypes* = set[TTokTypeRange]
 
 const
-  toktypes: TTokTypes = {TTokTypeRange(tkSymbol)..pred(tkIntLit), 
+  toktypes: TTokTypes = {TTokTypeRange(tkSymbol)..pred(tkIntLit), 
                          tkStrLit..tkTripleStrLit}
 
 var
@@ -51,14 +51,14 @@ else: write(stdout, "BUG: F ist nicht in s!\n")
 a = {} #{'a'..'z'}
 for x in low(TAZ) .. high(TAZ):
   incl(a, x)
-  if x in a: nil
+  if x in a: discard
   else: write(stdout, "BUG: something not in a!\n")
 
 for x in low(TTokTypeRange) .. high(TTokTypeRange):
   if x in tokTypes:
-    nil
+    discard
     #writeln(stdout, "the token '$1' is in the set" % repr(x))
 
 #OUT Ha ein F ist in s!
-
-
+
+