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      1 // compile
      2 
      3 // Copyright 2016 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 // Issue 17918: slice out-of-bounds in ssa/cse
      8 
      9 package dead
     10 
     11 import (
     12 	"fmt"
     13 	"time"
     14 )
     15 
     16 var (
     17 	units = []struct {
     18 		divisor time.Duration
     19 		unit    rune
     20 	}{
     21 		{1000000, 's'},
     22 		{60, 'm'},
     23 		{60, 'h'},
     24 		{24, 'd'},
     25 		{7, 'w'},
     26 	}
     27 )
     28 
     29 func foobar(d time.Duration) string {
     30 	d /= time.Microsecond
     31 	unit := 'u'
     32 
     33 	for _, f := range units {
     34 		if d%f.divisor != 0 {
     35 			break
     36 		}
     37 		d /= f.divisor
     38 		unit = f.unit
     39 	}
     40 	return fmt.Sprintf("%d%c", d, unit)
     41 }
     42