Source file src/internal/types/testdata/fixedbugs/issue80042.go

     1  // Copyright 2026 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  func f[P any](_ P) {}
     8  
     9  func _(x map[func /* ERROR "invalid map key type func(int)" */ (int)]bool) {
    10  	// While functions are not valid map keys, the intended type for P
    11  	// is still unambiguous here. Avoid "cannot use generic function f
    12  	// without instantiation".
    13  	x[f] = true
    14  }
    15  
    16  // same thinking applies through a type parameter
    17  func _[P map[func /* ERROR "invalid map key type func(int)" */ (int)]bool](x P) {
    18  	x[f] = true
    19  }
    20  

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