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// run -gcflags=-G=3
// 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
}
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)
}
var (
e0 = Eq[int]{Lit[int](128), Lit[int](64)}
e1 = Eq[bool]{Lit[bool](true), Lit[bool](true)}
)
func main() {
fmt.Printf("%v\n", e0)
fmt.Printf("%v\n", e1)
}
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