Remove expr/stmt (#5857)

tests/types/tauto_canbe_void.nim

@@ -1,7 +1,7 @@
 
 import future
 
-template tempo(s: expr) =
+template tempo(s) =
   s("arg")
 
 tempo((s: string)->auto => echo(s))

tests/types/tisopr.nim

@@ -17,10 +17,10 @@ proc IsVoid[T](): string =
 const x = int is int
 echo x, " ", float is float, " ", float is string, " ", IsVoid[void]()
 
-template yes(e: expr): stmt =
+template yes(e): void =
   static: assert e
 
-template no(e: expr): stmt =
+template no(e): void =
   static: assert(not e)
 
 when false: