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      1 // Copyright 2015 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package main
      6 
      7 func fail() // unimplemented, to test dead code elimination
      8 
      9 // Test dead code elimination in if statements
     10 func init() {
     11 	if false {
     12 		fail()
     13 	}
     14 	if 0 == 1 {
     15 		fail()
     16 	}
     17 }
     18 
     19 // Test dead code elimination in ordinary switch statements
     20 func init() {
     21 	const x = 0
     22 	switch x {
     23 	case 1:
     24 		fail()
     25 	}
     26 
     27 	switch 1 {
     28 	case x:
     29 		fail()
     30 	}
     31 
     32 	switch {
     33 	case false:
     34 		fail()
     35 	}
     36 
     37 	const a = "a"
     38 	switch a {
     39 	case "b":
     40 		fail()
     41 	}
     42 
     43 	const snowman = ''
     44 	switch snowman {
     45 	case '':
     46 		fail()
     47 	}
     48 
     49 	const zero = float64(0.0)
     50 	const one = float64(1.0)
     51 	switch one {
     52 	case -1.0:
     53 		fail()
     54 	case zero:
     55 		fail()
     56 	}
     57 
     58 	switch 1.0i {
     59 	case 1:
     60 		fail()
     61 	case -1i:
     62 		fail()
     63 	}
     64 
     65 	const no = false
     66 	switch no {
     67 	case true:
     68 		fail()
     69 	}
     70 
     71 	// Test dead code elimination in large ranges.
     72 	switch 5 {
     73 	case 3, 4, 5, 6, 7:
     74 	case 0, 1, 2:
     75 		fail()
     76 	default:
     77 		fail()
     78 	}
     79 }
     80 
     81 func main() {
     82 }
     83