moved a subset of source file to the kern package

t_expr_test.go

@@ -6,6 +6,8 @@ package expr
 
 import (
 	"testing"
+
+	"git.portale-stac.it/go-pkg/expr/kern"
 )
 
 func TestExpr(t *testing.T) {
@@ -29,7 +31,7 @@ func TestExpr(t *testing.T) {
 		/*  15 */ {`a=3; a*=2)+1; a`, nil, `[1:11] unexpected token ")"`},
 		/*  16 */ {`v=[2]; a=1; v[a-=1]=5; v[0]`, int64(5), nil},
 		/*  17 */ {`true ? {"a"} :: {"b"}`, "a", nil},
-		/*  18 */ {`$$`, NewDict(map[any]any{"variables": NewDict(nil), "functions": NewDict(nil)}), nil},
+		/*  18 */ {`$$`, kern.NewDict(map[any]any{"variables": kern.NewDict(nil), "functions": kern.NewDict(nil)}), nil},
 		///*  19 */ {`$$global`, NewDict(map[any]any{"variables": NewDict(nil), "functions": NewDict(nil)}), nil},
 		/*  19 */ {`
 		ds={