issue48703.go

     1  // Copyright 2021 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 p
     6  
     7  import "unsafe"
     8  
     9  // The actual example from the issue.
    10  type List[P any] struct{}
    11  
    12  func (_ List[P]) m() (_ List[List[P]]) { return }
    13  
    14  // Other types of recursion through methods.
    15  type R[P any] int
    16  
    17  func (*R[R /* ERROR "must be an identifier" */ [int]]) m0() {}
    18  func (R[P]) m1(R[R[P]])                                   {}
    19  func (R[P]) m2(R[*P])                                     {}
    20  func (R[P]) m3([unsafe.Sizeof(new(R[P]))]int)             {}
    21  func (R[P]) m4([unsafe.Sizeof(new(R[R[P]]))]int)          {}
    22  
    23  // Mutual recursion
    24  type M[P any] int
    25  
    26  func (R[P]) m5(M[M[P]]) {}
    27  func (M[P]) m(R[R[P]])  {}
    28
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