issue70189.go

     1  // run -goexperiment noswissmap
     2  
     3  // Copyright 2024 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  package main
     8  
     9  func nan() float64 {
    10  	var x, y float64
    11  	return x / y
    12  }
    13  
    14  func main() {
    15  	m := map[float64]int{}
    16  
    17  	// Make a small map with nan keys
    18  	for i := 0; i < 8; i++ {
    19  		m[nan()] = i
    20  	}
    21  
    22  	// Start iterating on it.
    23  	start := true
    24  	for _, v := range m {
    25  		if start {
    26  			// Add some more elements.
    27  			for i := 0; i < 10; i++ {
    28  				m[float64(i)] = i
    29  			}
    30  			// Now clear the map.
    31  			clear(m)
    32  			start = false
    33  		} else {
    34  			// We should never reach here.
    35  			panic(v)
    36  		}
    37  	}
    38  }
    39
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