throw: interface compare

panic PC=0x28ceb8 [1]
throw+0x41 /Users/rsc/goX/src/runtime/runtime.c:54
	throw(0x3014a, 0x0)
ifaceeq+0x15c /Users/rsc/goX/src/runtime/iface.c:501
	ifaceeq(0x2aa7c0, 0x0, 0x0, 0x0, 0x2aa7c0, ...)
sys·ifaceeq+0x48 /Users/rsc/goX/src/runtime/iface.c:527
	sys·ifaceeq(0x2aa7c0, 0x0, 0x0, 0x0, 0x2aa7c0, ...)
main·main+0x190 /Users/rsc/goX/src/cmd/gc/x.go:10
	main·main()

}
func interequal(p, q unsafe.Pointer) bool {
	x := *(*iface)(p)
	y := *(*iface)(q)
	return x.tab == y.tab && ifaceeq(x.tab, x.data, y.data)
}
func nilinterequal(p, q unsafe.Pointer) bool {
	x := *(*eface)(p)
	y := *(*eface)(q)
	return x._type == y._type && efaceeq(x._type, x.data, y.data)
}
func efaceeq(t *_type, x, y unsafe.Pointer) bool {
	if t == nil {
		return true
	}

	{"runtime.assertE2I2", 1},
	{"runtime.panicdottypeE", 1},
	{"runtime.panicdottypeI", 1},
	{"runtime.panicnildottype", 1},
	{"runtime.typeAssert", 1},
	{"runtime.interfaceSwitch", 1},
	{"runtime.ifaceeq", 1},
	{"runtime.efaceeq", 1},
	{"runtime.panicrangestate", 1},
	{"runtime.deferrangefunc", 1},
	{"runtime.rand32", 1},
	{"runtime.makemap64", 1},
	{"runtime.makemap", 1},
	{"runtime.makemap_small", 1},

func panicdottypeE(have, want, iface *byte)
func panicdottypeI(have, want, iface *byte)
func panicnildottype(want *byte)
func typeAssert(s *byte, typ *byte) *byte

// interface switches
func interfaceSwitch(s *byte, t *byte) (int, *byte)

// interface equality. Type/itab pointers are already known to be equal, so
// we only need to pass one.
func ifaceeq(tab *uintptr, x, y unsafe.Pointer) (ret bool)

	{"assertE2I2", funcTag, 67},
	{"panicdottypeE", funcTag, 68},
	{"panicdottypeI", funcTag, 68},
	{"panicnildottype", funcTag, 69},
	{"typeAssert", funcTag, 67},
	{"interfaceSwitch", funcTag, 70},
	{"ifaceeq", funcTag, 72},
	{"efaceeq", funcTag, 72},
	{"panicrangestate", funcTag, 73},
	{"deferrangefunc", funcTag, 74},
	{"rand32", funcTag, 75},
	{"makemap64", funcTag, 77},
	{"makemap", funcTag, 78},
	{"makemap_small", funcTag, 79},

package main

import (
	"log"
	"plugin"

	"testplugin/iface_i"
)

func main() {
	a, err := plugin.Open("iface_a.so")
	if err != nil {
		log.Fatalf(`plugin.Open("iface_a.so"): %v`, err)
	}
	b, err := plugin.Open("iface_b.so")
	if err != nil {
		log.Fatalf(`plugin.Open("iface_b.so"): %v`, err)
	}

	af, err := a.Lookup("F")
	if err != nil {

//
//go:linkname reflect_ifaceE2I reflect.ifaceE2I
func reflect_ifaceE2I(inter *interfacetype, e eface, dst *iface) {
	*dst = iface{assertE2I(inter, e._type), e.data}
}

//go:linkname reflectlite_ifaceE2I internal/reflectlite.ifaceE2I
func reflectlite_ifaceE2I(inter *interfacetype, e eface, dst *iface) {
	*dst = iface{assertE2I(inter, e._type), e.data}
}

func iterate_itabs(fn func(*itab)) {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import "testshared/iface_a"
import "testshared/iface_b"

func main() {
	if iface_a.F() != iface_b.F() {
		panic("empty interfaces not equal")
	}
	if iface_a.G() != iface_b.G() {
		panic("non-empty interfaces not equal")
	}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package iface_b

import "testshared/iface_i"

//go:noinline
func F() interface{} {
	return (*iface_i.T)(nil)
}

//go:noinline
func G() iface_i.I {
	return (*iface_i.T)(nil)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package iface_a

import "testshared/iface_i"

//go:noinline
func F() interface{} {
	return (*iface_i.T)(nil)
}

//go:noinline
func G() iface_i.I {
	return (*iface_i.T)(nil)