go/test/typeparam/tparam1.go

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// errorcheck
// 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.
// Basic type parameter list type-checking (not syntax) errors.
package tparam1
// The predeclared identifier "any" may be used in place of interface{}.
var _ any
func _(_ any)
type _[_ any] struct{}
const N = 10
type (
_ []struct{} // slice
_ [N]struct{} // array
_[T any] struct{}
_[T, T any] struct{} // ERROR "T redeclared"
_[T1, T2 any, T3 any] struct{}
)
func _[T any]() {}
func _[T, T any]() {} // ERROR "T redeclared"
func _[T1, T2 any](x T1) T2 { panic(0) }
// Type parameters are visible from opening [ to end of function.
type C interface{}
func _[T interface{}]() {}
func _[T C]() {}
func _[T struct{}]() {} // ok if #48424 is accepted
func _[T interface{ m() T }]() {}
func _[T1 interface{ m() T2 }, T2 interface{ m() T1 }]() {
var _ T1
}
// TODO(gri) expand this