1 // run 2 3 // Copyright 2009 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Test typed integer constants. 8 9 package main 10 11 import "fmt" 12 13 type T int 14 15 func (t T) String() string { return fmt.Sprintf("T%d", int(t)) } 16 17 const ( 18 A T = 1 << (1 << iota) 19 B 20 C 21 D 22 E 23 ) 24 25 func main() { 26 s := fmt.Sprintf("%v %v %v %v %v", A, B, C, D, E) 27 if s != "T2 T4 T16 T256 T65536" { 28 println("type info didn't propagate in const: got", s) 29 panic("fail") 30 } 31 x := uint(5) 32 y := float64(uint64(1)<<x) // used to fail to compile 33 if y != 32 { 34 println("wrong y", y) 35 panic("fail") 36 } 37 } 38
