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// run
// 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 "fmt"
type Exp[Ty any] interface {
Eval() Ty
}
// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// type Lit[Ty any] Ty
//
// func (lit Lit[Ty]) Eval() Ty { return Ty(lit) }
// func (lit Lit[Ty]) String() string { return fmt.Sprintf("(lit %v)", Ty(lit)) }
type Eq[Ty any] struct {
a Exp[Ty]
b Exp[Ty]
}
func (e Eq[Ty]) String() string {
return fmt.Sprintf("(eq %v %v)", e.a, e.b)
}
// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// var (
// e0 = Eq[int]{Lit[int](128), Lit[int](64)}
// e1 = Eq[bool]{Lit[bool](true), Lit[bool](true)}
// )
func main() {
// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// fmt.Printf("%v\n", e0)
// fmt.Printf("%v\n", e1)
}