(reflect?) issue with github.com/bradfitz/gomemcache/memcache

[mpl]

The following program sample.go triggers an unexpected result

package main

import (
	"log"

	"github.com/bradfitz/gomemcache/memcache"
)

func main() {
	mc := memcache.New("localhost:11211", "localhost:11212")
	mc.Set(&memcache.Item{Key: "foo", Value: []byte("my value")})

	it, err := mc.Get("foo")
	if err != nil {
		log.Fatal(err)
	}
	println(it.Key)
	for _, v := range it.Value {
		println(string(v))
	}

}

Expected result

$ docker run -p 11211:11211 --name my-memcache2 -d memcached -p 11211
178dd9c73df173a19616bcf3d65538f462fe71d83d03f5c3cc40cd17376f0fbe
$ docker run -p 11212:11212 --name my-memcache -d memcached -p 11212
1dd4a193c0ec32c0ef31b04601988ee8ca3d2529806380a69dc025b840a58686
$
$ GO111MODULE=off go run ./main.go 
foo
m
y
 
v
a
l
u
e

Got

% yaegi run ./main.go 
/Users/mpl/src/github.com/bradfitz/gomemcache/memcache/memcache.go:542:9: panic
./main.go:10:8: panic
run: reflect: Call using func(*bufio.ReadWriter, *struct { Key string; Value []uint8; Flags uint32; Expiration int32; Xcasid uint64 }) error as type func(*struct { Timeout time.Duration; MaxIdleConns int; Xselector interp.valueInterface; Xlk sync.Mutex; Xfreeconn map[string][]*struct { Xnc net.Conn; Xrw *bufio.ReadWriter; Xaddr net.Addr; Xc *unsafe2.dummy } }, *bufio.ReadWriter, *struct { Key string; Value []uint8; Flags uint32; Expiration int32; Xcasid uint64 }) error
goroutine 1 [running]:
runtime/debug.Stack()
	/Users/mpl/go1/src/runtime/debug/stack.go:24 +0x65
github.com/traefik/yaegi/interp.(*Interpreter).Execute.func1()
	/Users/mpl/src/github.com/traefik/yaegi/interp/program.go:146 +0x94
panic({0x1978e40, 0xc0004a6270})
	/Users/mpl/go1/src/runtime/panic.go:884 +0x212
github.com/traefik/yaegi/interp.runCfg.func1()
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:192 +0x148
panic({0x1978e40, 0xc0004a6270})
	/Users/mpl/go1/src/runtime/panic.go:884 +0x212
github.com/traefik/yaegi/interp.runCfg.func1()
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:192 +0x148
panic({0x1978e40, 0xc0004a6270})
	/Users/mpl/go1/src/runtime/panic.go:884 +0x212
reflect.Value.call({0xc000624de0?, 0xc0003c64b0?, 0xc00004a980?}, {0x1a9e70e, 0x4}, {0xc0003c64e0, 0x2, 0xc0000a0a20?})
	/Users/mpl/go1/src/reflect/value.go:440 +0x1abf
reflect.Value.Call({0xc000624de0?, 0xc0003c64b0?, 0x16?}, {0xc0003c64e0?, 0x1a6ef60?, 0xc0002cfad0?})
	/Users/mpl/go1/src/reflect/value.go:368 +0xbc
github.com/traefik/yaegi/interp.call.func9.2({0xc0003c64e0?, 0xc0003c64b0?, 0x2?})
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:1288 +0x3c
github.com/traefik/yaegi/interp.call.func9(0xc0002cfad0)
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:1303 +0x122f
github.com/traefik/yaegi/interp.runCfg(0xc0000a0000, 0xc0002cfad0, 0x1?, 0xc000469ac0?)
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:200 +0x29d
github.com/traefik/yaegi/interp.genFunctionWrapper.func1.1({0xc000012960, 0x1, 0x1?})
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:1002 +0x4a5
reflect.Value.call({0xc0007ec480?, 0xc0003c6330?, 0x1011c9f?}, {0x1a9e70e, 0x4}, {0xc000012948, 0x1, 0x10d4fde?})
	/Users/mpl/go1/src/reflect/value.go:584 +0x8c5
reflect.Value.Call({0xc0007ec480?, 0xc0003c6330?, 0x1055ff2?}, {0xc000012948?, 0x1a9c4c0?, 0x218d801?})
	/Users/mpl/go1/src/reflect/value.go:368 +0xbc
github.com/traefik/yaegi/interp.call.func9.2({0xc000012948?, 0xc0003c6330?, 0xc000012588?})
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:1288 +0x3c
github.com/traefik/yaegi/interp.call.func9(0xc0002cf4a0)
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:1303 +0x122f
github.com/traefik/yaegi/interp.runCfg(0xc0002d7c20, 0xc0002cf4a0, 0xc0002d70e0?, 0x0?)
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:200 +0x29d
github.com/traefik/yaegi/interp.(*Interpreter).run(0xc0002cc000, 0xc0002d70e0, 0xc0002ce000?)
	/Users/mpl/src/github.com/traefik/yaegi/interp/run.go:119 +0x38e
github.com/traefik/yaegi/interp.(*Interpreter).Execute(0xc0002cc000, 0xc0007f4d50)
	/Users/mpl/src/github.com/traefik/yaegi/interp/program.go:172 +0x24b
github.com/traefik/yaegi/interp.(*Interpreter).eval(0xc0002cc000, {0xc000400300?, 0x16e?}, {0x7ff7bfeff5da?, 0xc000400000?}, 0x6e?)
	/Users/mpl/src/github.com/traefik/yaegi/interp/interp.go:561 +0x5c
github.com/traefik/yaegi/interp.(*Interpreter).EvalPath(0xc0002cc000, {0x7ff7bfeff5da, 0x9})
	/Users/mpl/src/github.com/traefik/yaegi/interp/interp.go:510 +0xab
main.runFile(0x7ff7bfeff5da?, {0x7ff7bfeff5da, 0x9}, 0x0)
	/Users/mpl/src/github.com/traefik/yaegi/cmd/yaegi/run.go:153 +0xee
main.run({0xc0001241a0?, 0x1, 0x1})
	/Users/mpl/src/github.com/traefik/yaegi/cmd/yaegi/run.go:116 +0xbec
main.main()
	/Users/mpl/src/github.com/traefik/yaegi/cmd/yaegi/yaegi.go:133 +0xcf

Yaegi Version

eee72d1

Additional Notes

No response