don't read into the heap while incrementing self.s (#1233, #1245)

src/examples/least_time.pl

@@ -11,7 +11,7 @@
  */
 
 :- module(least_time, [find_min_time/2,
-		               write_time_nl/1]).
+                       write_time_nl/1]).
 
 
 :- use_module(library(dcgs)).
@@ -27,10 +27,10 @@ valid_time([H1,H2,M1,M2], T) :-
     memberd_t(M2, [0,1,2,3,4,5,6,7,8,9], TM2),
     (  maplist(=(true), [TH1, TH2, TM1, TM2]) ->
        (  H1 =:= 2 ->
-	      (  H2 =< 3 ->
-	         T = true
-	      ;  T = false
-	      )
+          (  H2 =< 3 ->
+             T = true
+          ;  T = false
+          )
        ;  T = true
        )
     ;  T = false