go issue50177 源码
golang issue50177 代码
文件路径：/test/typeparam/issue50177.go
// 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 "fmt"
type Fn[T any] func(T)
type FnErr[T any] func(T) error
// Test that local generic types across functions don't conflict, and they also don't
// conflict with local non-generic types and local variables.
func caller0() {
type X[T any] struct {
fn Fn[int]
}
x := X[int]{func(v int) { fmt.Println(v) }}
x.fn(0)
}
func caller1(val int) {
type X[T any] struct {
fn FnErr[int]
}
x := X[int]{func(v int) error { fmt.Println(v); return nil }}
x.fn(0)
}
func caller1a(val int) {
type X struct {
fn func(float64) error
}
x := X{func(v float64) error { fmt.Println(v); return nil }}
x.fn(float64(3.2))
}
func caller1b(val int) {
type Y struct {
fn func(float64) error
}
X := Y{func(v float64) error { fmt.Println(v); return nil }}
X.fn(float64(3.2))
}
// Test that local generic types within different if clauses don't conflict.
func caller2(val int) {
if val > 2 {
type X[T any] struct {
fn func(v int) float64
}
x := X[int]{func(v int) float64 { fmt.Println(v); return 1.5 }}
x.fn(0)
} else {
type X[T any] struct {
fn func(v int) int
}
x := X[int]{func(v int) int { fmt.Println(v); return 5 }}
x.fn(0)
}
}
// Test that local generic types within different cases don't conflict with each
// other or with local non-generic types or local variables.
func caller3(val int) {
switch val {
case 0:
type X[T any] struct {
fn func(v int) float64
}
x := X[int]{func(v int) float64 { fmt.Println(v); return 1.5 }}
x.fn(0)
case 1:
type X[T any] struct {
fn func(v int) int
}
x := X[int]{func(v int) int { fmt.Println(v); return 5 }}
x.fn(0)
case 2:
type X struct {
fn func(v int) bool
}
x := X{func(v int) bool { fmt.Println(v); return false }}
x.fn(0)
case 3:
type Y struct {
fn func(v int) bool
}
X := Y{func(v int) bool { fmt.Println(v); return false }}
X.fn(0)
}
}
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