fixes #2979

compiler/ccgexprs.nim

@@ -1582,7 +1582,8 @@ proc genRangeChck(p: BProc, n: PNode, d: var TLoc, magic: string) =
   var a: TLoc
   var dest = skipTypes(n.typ, abstractVar)
   # range checks for unsigned turned out to be buggy and annoying:
-  if optRangeCheck notin p.options or dest.kind in {tyUInt..tyUInt64}:
+  if optRangeCheck notin p.options or dest.skipTypes({tyRange}).kind in
+                                             {tyUInt..tyUInt64}:
     initLocExpr(p, n.sons[0], a)
     putIntoDest(p, d, n.typ, "(($1) ($2))" %
         [getTypeDesc(p.module, dest), rdCharLoc(a)])