mirror of
https://github.com/golang/go
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38 lines
704 B
Go
38 lines
704 B
Go
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// run -gcflags=-G=3
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// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "fmt"
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type Exp[Ty any] interface {
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Eval() Ty
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}
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type Lit[Ty any] Ty
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func (lit Lit[Ty]) Eval() Ty { return Ty(lit) }
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func (lit Lit[Ty]) String() string { return fmt.Sprintf("(lit %v)", Ty(lit)) }
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type Eq[Ty any] struct {
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a Exp[Ty]
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b Exp[Ty]
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}
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func (e Eq[Ty]) String() string {
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return fmt.Sprintf("(eq %v %v)", e.a, e.b)
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}
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var (
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e0 = Eq[int]{Lit[int](128), Lit[int](64)}
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e1 = Eq[bool]{Lit[bool](true), Lit[bool](true)}
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)
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func main() {
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fmt.Printf("%v\n", e0)
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fmt.Printf("%v\n", e1)
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}
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