issue69434.go

     1  // run
     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  import (
    10  	"iter"
    11  )
    12  
    13  func All() iter.Seq[int] {
    14  	return func(yield func(int) bool) {
    15  		for i := 0; i < 10; i++ {
    16  			growStack(512)
    17  			if !yield(i) {
    18  				return
    19  			}
    20  		}
    21  	}
    22  }
    23  
    24  type S struct {
    25  	round int
    26  }
    27  
    28  func NewS(round int) *S {
    29  	s := &S{round: round}
    30  	return s
    31  }
    32  
    33  func (s *S) check(round int) {
    34  	if s.round != round {
    35  		panic("bad round")
    36  	}
    37  }
    38  
    39  func f() {
    40  	rounds := 0
    41  	s := NewS(rounds)
    42  	s.check(rounds)
    43  
    44  	for range All() {
    45  		s.check(rounds)
    46  		rounds++
    47  		s = NewS(rounds)
    48  		s.check(rounds)
    49  	}
    50  }
    51  
    52  func growStack(i int) {
    53  	if i == 0 {
    54  		return
    55  	}
    56  	growStack(i - 1)
    57  }
    58  
    59  func main() {
    60  	f()
    61  }
    62
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