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Source file test/const3.go

Documentation: test

  // run
  
  // Copyright 2009 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.
  
  // Test typed integer constants.
  
  package main
  
  import "fmt"
  
  type T int
  
  func (t T) String() string { return fmt.Sprintf("T%d", int(t)) }
  
  const (
  	A T = 1 << (1 << iota)
  	B
  	C
  	D
  	E
  )
  
  func main() {
  	s := fmt.Sprintf("%v %v %v %v %v", A, B, C, D, E)
  	if s != "T2 T4 T16 T256 T65536" {
  		println("type info didn't propagate in const: got", s)
  		panic("fail")
  	}
  	x := uint(5)
  	y := float64(uint64(1)<<x)	// used to fail to compile
  	if y != 32 {
  		println("wrong y", y)
  		panic("fail")
  	}
  }
  

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