fix marshal bugs in VM (#19161) [backport:1.6]

(cherry picked from commit fe46c8b5f1)

compiler/vmmarshal.nim

@@ -92,7 +92,8 @@ proc storeAny(s: var string; t: PType; a: PNode; stored: var IntSet;
       if a[i].kind == nkRange:
         var x = copyNode(a[i][0])
         storeAny(s, t.lastSon, x, stored, conf)
-        while x.intVal+1 <= a[i][1].intVal:
+        inc x.intVal
+        while x.intVal <= a[i][1].intVal:
           s.add(", ")
           storeAny(s, t.lastSon, x, stored, conf)
           inc x.intVal
@@ -231,7 +232,6 @@ proc loadAny(p: var JsonParser, t: PType,
     result = newNode(nkCurly)
     while p.kind != jsonArrayEnd and p.kind != jsonEof:
       result.add loadAny(p, t.lastSon, tab, cache, conf, idgen)
-      next(p)
     if p.kind == jsonArrayEnd: next(p)
     else: raiseParseErr(p, "']' end of array expected")
   of tyPtr, tyRef:

tests/ccgbugs/t8967.nim

@@ -4,7 +4,11 @@ discard """
 
 import marshal
 
-let orig: set[char] = {'A'..'Z'}
-let m = $$orig
-let old = to[set[char]](m)
-doAssert orig - old == {}
+template main() =
+  let orig: set[char] = {'A'..'Z'}
+  let m = $$orig
+  let old = to[set[char]](m)
+  doAssert orig - old == {}
+
+static: main()
+main()