fixes #3192

compiler/lambdalifting.nim

@@ -184,7 +184,7 @@ proc addHiddenParam(routine: PSym, param: PSym) =
   var params = routine.ast.sons[paramsPos]
   # -1 is correct here as param.position is 0 based but we have at position 0
   # some nkEffect node:
-  param.position = params.len-1
+  param.position = routine.typ.n.len-1
   addSon(params, newSymNode(param))
   incl(routine.typ.flags, tfCapturesEnv)
   assert sfFromGeneric in param.flags

compiler/vm.nim

@@ -432,7 +432,7 @@ proc rawExecute(c: PCtx, start: int, tos: PStackFrame): TFullReg =
         assert regs[rb].kind == rkNode
         let nb = regs[rb].node
         case nb.kind
-        of nkCharLit..nkInt64Lit:
+        of nkCharLit..nkUInt64Lit:
           ensureKind(rkInt)
           regs[ra].intVal = nb.intVal
         of nkFloatLit..nkFloat64Lit: