issue75986.go

     1  // -lang=go1.25
     2  
     3  // Copyright 2025 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 p
     8  
     9  import "strings"
    10  
    11  type T int
    12  type G[P any] struct{}
    13  
    14  var x T
    15  
    16  // Verify that we don't get a version error when there's another error present in new(expr).
    17  
    18  func f() {
    19  	_ = new(U /* ERROR "undefined: U" */)
    20  	_ = new(strings.BUILDER /* ERROR "undefined: strings.BUILDER (but have Builder)" */)
    21  	_ = new(T)      // ok
    22  	_ = new(G[int]) // ok
    23  	_ = new(G /* ERROR "cannot use generic type G without instantiation" */)
    24  	_ = new(nil /* ERROR "use of untyped nil in argument to new" */)
    25  	_ = new(comparable /* ERROR "cannot use type comparable outside a type constraint" */)
    26  	_ = new(new /* ERROR "new (built-in) must be called" */)
    27  	_ = new(panic /* ERROR "panic(0) (no value) used as value or type" */ (0))
    28  }
    29
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