go/test/notinheap.go

// errorcheck -+

// Copyright 2016 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.

// Test type-checking errors for go:notinheap.

package p

//go:notinheap
type nih struct{}

// Types embedding notinheap types must be notinheap.

type embed1 struct {
	x nih
} // ERROR "must be go:notinheap"

type embed2 [1]nih // ERROR "must be go:notinheap"

type embed3 struct {
	x [1]nih
} // ERROR "must be go:notinheap"

type embed4 map[nih]int // ERROR "go:notinheap map key not allowed"

type embed5 map[int]nih // ERROR "go:notinheap map value not allowed"

type emebd6 chan nih // ERROR "chan of go:notinheap type not allowed"

type okay1 *nih

type okay2 []nih

type okay3 func(x nih) nih

type okay4 interface {
	f(x nih) nih
}

// Type conversions don't let you sneak past notinheap.

type t1 struct{ x int }

//go:notinheap
type t2 t1

var sink interface{}

func i() {
	sink = new(t1)                     // no error
	sink = (*t2)(new(t1))              // ERROR "cannot convert(.|\n)*t2 is go:notinheap"
	sink = (*t2)(new(struct{ x int })) // ERROR "cannot convert(.|\n)*t2 is go:notinheap"
}