issue50417b.go

     1  // run
     2  
     3  // Copyright 2022 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 main() {}
    10  
    11  // Field accesses through type parameters are disabled
    12  // until we have a more thorough understanding of the
    13  // implications on the spec. See issue #51576.
    14  
    15  /*
    16  import "fmt"
    17  
    18  type MyStruct struct {
    19  	b1, b2 string
    20  	E
    21  }
    22  
    23  type E struct {
    24  	val int
    25  }
    26  
    27  type C interface {
    28  	~struct {
    29  		b1, b2 string
    30  		E
    31  	}
    32  }
    33  
    34  func f[T C]() T {
    35  	var x T = T{
    36  		b1: "a",
    37  		b2: "b",
    38  	}
    39  
    40  	if got, want := x.b2, "b"; got != want {
    41  		panic(fmt.Sprintf("got %d, want %d", got, want))
    42  	}
    43  	x.b1 = "y"
    44  	x.val = 5
    45  
    46  	return x
    47  }
    48  
    49  func main() {
    50  	x := f[MyStruct]()
    51  	if got, want := x.b1, "y"; got != want {
    52  		panic(fmt.Sprintf("got %d, want %d", got, want))
    53  	}
    54  	if got, want := x.val, 5; got != want {
    55  		panic(fmt.Sprintf("got %d, want %d", got, want))
    56  	}
    57  }
    58  */
    59
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