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// Copyright 2022 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.
package b
import "./a"
type (
lA[P any] [10]P
lS[P any] struct{ f P }
lP[P any] *P
lM[K comparable, V any] map[K]V
)
// local cycles
type (
A lA[A] // ERROR "invalid recursive type"
S lS[S] // ERROR "invalid recursive type"
P lP[P] // ok (indirection through lP)
M1 lM[int, M1] // ok (indirection through lM)
M2 lM[lA[byte], M2] // ok (indirection through lM)
A2 lA[lS[lP[A2]]] // ok (indirection through lP)
A3 lA[lS[lS[A3]]] // ERROR "invalid recursive type"
)
// cycles through imported types
type (
Ai a.A[Ai] // ERROR "invalid recursive type"
Si a.S[Si] // ERROR "invalid recursive type"
Pi a.P[Pi] // ok (indirection through a.P)
M1i a.M[int, M1i] // ok (indirection through a.M)
M2i a.M[a.A[byte], M2i] // ok (indirection through a.M)
A2i a.A[a.S[a.P[A2i]]] // ok (indirection through a.P)
A3i a.A[a.S[a.S[A3i]]] // ERROR "invalid recursive type"
T2 a.S[T0[T2]] // ERROR "invalid recursive type"
T3 T0[Ai] // no follow-on error here
)
// test case from issue
type T0[P any] struct {
f P
}
type T1 struct { // ERROR "invalid recursive type"
_ T0[T1]
}