linked-list: sum and in operators

operator-in.go

@@ -9,6 +9,7 @@ import (
 	"git.portale-stac.it/go-pkg/expr/scan"
 	"git.portale-stac.it/go-pkg/expr/types/array"
 	"git.portale-stac.it/go-pkg/expr/types/dict"
+	"git.portale-stac.it/go-pkg/expr/types/list"
 )
 
 //-------- in term
@@ -41,6 +42,9 @@ func evalIn(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 	} else if dict.IsDict(rightValue) {
 		dict, _ := rightValue.(*dict.DictType)
 		v = dict.HasKey(leftValue)
+	} else if list.IsLinkedList(rightValue) {
+		ls, _ := rightValue.(*list.LinkedList)
+		v = ls.HasValue(leftValue)
 	} else {
 		err = opTerm.ErrIncompatibleTypes(leftValue, rightValue)
 	}