// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Examples adjusted to match new [T any] syntax for type parameters.
// Also, previously permitted empty type parameter lists and instantiations
// are now syntax errors.

package p

// crash 1
type nt1[_ any]interface{g /* ERROR undeclared name */ }
type ph1[e nt1[e],g(d /* ERROR undeclared name */ )]s /* ERROR undeclared name */
func(*ph1[e,e /* ERROR redeclared */ ])h(d /* ERROR undeclared name */ )

// crash 2
// Disabled: empty []'s are now syntax errors. This example leads to too many follow-on errors.
// type Numeric2 interface{t2 /* ERROR not a type */ }
// func t2[T Numeric2](s[]T){0 /* ERROR not a type */ []{s /* ERROR cannot index */ [0][0]}}

// crash 3
type t3 *interface{ t3.p /* ERROR no field or method p */ }

// crash 4
type Numeric4 interface{t4 /* ERROR not a type */ }
func t4[T Numeric4](s[]T){if( /* ERROR non-boolean */ 0){*s /* ERROR cannot indirect */ [0]}}

// crash 7
type foo7 interface { bar() }
type x7[A any] struct{ foo7 }
func main7() { var _ foo7 = x7[int]{} }

// crash 8
// Embedding stand-alone type parameters is not permitted for now. Disabled.
// type foo8[A any] interface { ~A }
// func bar8[A foo8[A]](a A) {}
// func main8() {}

// crash 9
type foo9[A any] interface { foo9 /* ERROR illegal cycle */ [A] }
func _() { var _ = new(foo9[int]) }

// crash 12
var u /* ERROR cycle */ , i [func /* ERROR used as value */ /* ERROR used as value */ (u, c /* ERROR undeclared */ /* ERROR undeclared */ ) {}(0, len /* ERROR must be called */ /* ERROR must be called */ )]c /* ERROR undeclared */ /* ERROR undeclared */

// crash 15
func y15() { var a /* ERROR declared but not used */ interface{ p() } = G15[string]{} }
type G15[X any] s /* ERROR undeclared name */
func (G15 /* ERROR generic type .* without instantiation */ ) p()

// crash 16
type Foo16[T any] r16 /* ERROR not a type */
func r16[T any]() Foo16[Foo16[T]] { panic(0) }

// crash 17
type Y17 interface{ c() }
type Z17 interface {
	c() Y17
	Y17 /* ERROR duplicate method */
}
func F17[T Z17](T) {}

// crash 18
type o18[T any] []func(_ o18[[]_ /* ERROR cannot use _ */ ])

// crash 19
type Z19 [][[]Z19{}[0][0]]c19 /* ERROR undeclared */

// crash 20
type Z20 /* ERROR illegal cycle */ interface{ Z20 }
func F20[t Z20]() { F20(t /* ERROR invalid composite literal type */ {}) }

// crash 21
type Z21 /* ERROR illegal cycle */ interface{ Z21 }
func F21[T Z21]() { ( /* ERROR not used */ F21[Z21]) }

// For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
// // crash 24
// type T24[P any] P
// func (r T24[P]) m() { T24 /* ERROR without instantiation */ .m() }

// crash 25
type T25[A any] int
func (t T25[A]) m1() {}
var x T25 /* ERROR without instantiation */ .m1

// crash 26
type T26 = interface{ F26[ /* ERROR interface method must have no type parameters */ Z any]() }
// The error messages on the line below differ from types2 because for backward
// compatibility go/parser must produce an IndexExpr with BadExpr index for the
// expression F26[].
func F26[Z any]() T26 { return F26[] /* ERROR operand */ }

// crash 27
func e27[T any]() interface{ x27 /* ERROR not a type */ } { panic(0) }
func x27() { e27 /* ERROR cannot infer T */ () }