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Source file test/fixedbugs/issue15528.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2016 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"
  	"io"
  	"os"
  	"reflect"
  	"unsafe"
  )
  
  type RWS struct{}
  
  func (x *RWS) Read(p []byte) (n int, err error)                   { return }
  func (x *RWS) Write(p []byte) (n int, err error)                  { return }
  func (x *RWS) Seek(offset int64, whence int) (n int64, err error) { return }
  func (x *RWS) String() string                                     { return "rws" }
  
  func makeRWS() io.ReadWriteSeeker { return &RWS{} }
  func makeStringer() fmt.Stringer  { return &RWS{} }
  
  // Test correct construction of static empty interface values
  var efaces = [...]struct {
  	x interface{}
  	s string
  }{
  	{nil, "<nil> <nil>"},
  	{1, "int 1"},
  	{int(1), "int 1"},
  	{Int(int(2)), "main.Int Int=2"},
  	{int(Int(3)), "int 3"},
  	{[1]int{2}, "[1]int [2]"},
  	{io.Reader(io.ReadWriter(io.ReadWriteSeeker(nil))), "<nil> <nil>"},
  	{io.Reader(io.ReadWriter(io.ReadWriteSeeker(&RWS{}))), "*main.RWS rws"},
  	{makeRWS(), "*main.RWS rws"},
  	{map[string]string{"here": "there"}, "map[string]string map[here:there]"},
  	{chan bool(nil), "chan bool <nil>"},
  	{unsafe.Pointer(uintptr(0)), "unsafe.Pointer <nil>"},
  	{(*byte)(nil), "*uint8 <nil>"},
  	{io.Writer((*os.File)(nil)), "*os.File <nil>"},
  	{(interface{})(io.Writer((*os.File)(nil))), "*os.File <nil>"},
  	{fmt.Stringer(Strunger(((*Int)(nil)))), "*main.Int <nil>"},
  }
  
  type Int int
  
  func (i Int) String() string { return fmt.Sprintf("Int=%d", i) }
  func (i Int) Strung()        {}
  
  type Strunger interface {
  	fmt.Stringer
  	Strung()
  }
  
  // Test correct construction of static non-empty interface values
  var ifaces = [...]struct {
  	x fmt.Stringer
  	s string
  }{
  	{nil, "<nil> <nil> %!s(<nil>)"},
  	{Int(3), "main.Int 3 Int=3"},
  	{Int(int(Int(4))), "main.Int 4 Int=4"},
  	{Strunger(Int(5)), "main.Int 5 Int=5"},
  	{makeStringer(), "*main.RWS &main.RWS{} rws"},
  	{fmt.Stringer(nil), "<nil> <nil> %!s(<nil>)"},
  	{(*RWS)(nil), "*main.RWS (*main.RWS)(nil) rws"},
  }
  
  // Test correct handling of direct interface values
  var (
  	one  int         = 1
  	iptr interface{} = &one
  	clos int
  	f    interface{} = func() { clos++ }
  	deep interface{} = [1]struct{ a *[2]byte }{{a: &[2]byte{'z', 'w'}}}
  	ch   interface{} = make(chan bool, 1)
  )
  
  func main() {
  	var fail bool
  	for i, test := range efaces {
  		s := fmt.Sprintf("%[1]T %[1]v", test.x)
  		if s != test.s {
  			fmt.Printf("eface(%d)=%q want %q\n", i, s, test.s)
  			fail = true
  		}
  	}
  
  	for i, test := range ifaces {
  		s := fmt.Sprintf("%[1]T %#[1]v %[1]s", test.x)
  		if s != test.s {
  			fmt.Printf("iface(%d)=%q want %q\n", i, s, test.s)
  			fail = true
  		}
  	}
  
  	if got := *(iptr.(*int)); got != 1 {
  		fmt.Printf("bad int ptr %d\n", got)
  		fail = true
  	}
  
  	f.(func())()
  	f.(func())()
  	f.(func())()
  	if clos != 3 {
  		fmt.Printf("bad closure exec %d\n", clos)
  		fail = true
  	}
  
  	if !reflect.DeepEqual(*(deep.([1]struct{ a *[2]byte })[0].a), [2]byte{'z', 'w'}) {
  		fmt.Printf("bad deep directiface\n")
  		fail = true
  	}
  
  	cc := ch.(chan bool)
  	cc <- true
  	if got := <-cc; !got {
  		fmt.Printf("bad chan\n")
  		fail = true
  	}
  
  	if fail {
  		fmt.Println("BUG")
  		os.Exit(1)
  	}
  }
  

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