Initial commit: Go 1.23 release state

test/typeparam/issue47896.go

@@ -0,0 +1,74 @@
+//  compile
+
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"database/sql"
+)
+
+// Collection generic interface which things can be added to.
+type Collection[T any] interface {
+	Add(T)
+}
+
+// Slice generic slice implementation of a Collection
+type Slice[T any] []*T
+
+func (s *Slice[T]) Add(t *T) {
+	*s = append(*s, t)
+}
+
+type Scanner interface {
+	Scan(...interface{}) error
+}
+
+type Mapper[T any] func(s Scanner, t T) error
+
+type Repository[T any] struct {
+	db *sql.DB
+}
+
+func (r *Repository[T]) scan(rows *sql.Rows, m Mapper[*T], c Collection[*T]) error {
+	for rows.Next() {
+		t := new(T)
+		if err := m(rows, t); err != nil {
+			return err
+		}
+		c.Add(t)
+	}
+	return rows.Err()
+}
+
+func (r *Repository[T]) query(query string, m Mapper[*T], c Collection[*T]) error {
+	rows, err := r.db.Query(query)
+	if err != nil {
+		return err
+	}
+	if err := r.scan(rows, m, c); err != nil {
+		rows.Close()
+		return err
+	}
+	return rows.Close()
+}
+
+type Actor struct {
+	ActorID   uint16
+	FirstName string
+	LastName  string
+}
+
+type ActorRepository struct {
+	r Repository[Actor]
+}
+
+func (ActorRepository) scan(s Scanner, a *Actor) error {
+	return s.Scan(&a.ActorID, &a.FirstName, &a.LastName)
+}
+
+func (r *ActorRepository) SelectAll(c Collection[*Actor]) error {
+	return r.r.query("SELECT `actor_id`, `first_name`, `last_name` FROM `actor` LIMIT 10", r.scan, c)
+}