exporting method as variable

[mvertes]

The following program sample.go triggers an unexpected result

package main

import "sample/d2"   // see below for d2 definition

func main() {
    f := d2.F
    f()
}

Expected result

$ GO111MODULE=off go run ./sample.go
test

Got

$ yaegi ./sample.go
/Users/marc/go/src/sample/d1/d1.go:7:27: panic
sample.go:7:2: panic
run: reflect: call of reflect.Value.Field on zero Value
goroutine 1 [running]:
runtime/debug.Stack(0x1, 0x140002f8e00, 0x40)
	runtime/debug/stack.go:24 +0x88
github.com/traefik/yaegi/interp.(*Interpreter).eval.func1(0x140004cfbf0)
	github.com/traefik/yaegi/interp/interp.go:503 +0x94
panic(0x1036a0f60, 0x140001a2e70)
	runtime/panic.go:965 +0x14c
github.com/traefik/yaegi/interp.runCfg.func1(0x140001d6b00, 0x140001cf100, 0x140004cf9c0)
	github.com/traefik/yaegi/interp/run.go:185 +0x1e8
panic(0x1036a0f60, 0x140001a2e70)
	runtime/panic.go:965 +0x14c
github.com/traefik/yaegi/interp.runCfg.func1(0x140001d6bb0, 0x140004c6000, 0x140004cf780)
	github.com/traefik/yaegi/interp/run.go:185 +0x1e8
panic(0x1036a0f60, 0x140001a2e70)
	runtime/panic.go:965 +0x14c
reflect.Value.Field(0x0, 0x0, 0x0, 0x0, 0x1, 0x1, 0x140004cf748)
	reflect/value.go:850 +0x11c
reflect.Value.FieldByIndex(0x0, 0x0, 0x0, 0x140003769f0, 0x1, 0x1, 0x10, 0x103f10a68, 0x10)
	reflect/value.go:882 +0x1f0
github.com/traefik/yaegi/interp.getPtrIndexSeq.func3(0x140001d6bb0, 0x10366df00)
	github.com/traefik/yaegi/interp/run.go:1917 +0xd0
github.com/traefik/yaegi/interp.runCfg(0x140004c6000, 0x140001d6bb0)
	github.com/traefik/yaegi/interp/run.go:191 +0x8c
github.com/traefik/yaegi/interp.call.func7(0x140001d6b00, 0x14000253f10)
	github.com/traefik/yaegi/interp/run.go:1280 +0xa20
github.com/traefik/yaegi/interp.runCfg(0x140001cf100, 0x140001d6b00)
	github.com/traefik/yaegi/interp/run.go:191 +0x8c
github.com/traefik/yaegi/interp.(*Interpreter).run(0x1400037a000, 0x140001ce900, 0x140001d68f0)
	github.com/traefik/yaegi/interp/run.go:122 +0x244
github.com/traefik/yaegi/interp.(*Interpreter).eval(0x1400037a000, 0x140001838c0, 0x5a, 0x16d1c37fe, 0xb, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	github.com/traefik/yaegi/interp/interp.go:595 +0x5e8
github.com/traefik/yaegi/interp.(*Interpreter).EvalPath(0x1400037a000, 0x16d1c37fe, 0xb, 0x14000183800, 0x5a, 0x0, 0x0, 0x0)
	github.com/traefik/yaegi/interp/interp.go:417 +0xc4
main.runFile(0x1400037a000, 0x16d1c37fe, 0xb, 0x0, 0x0, 0x0)
	github.com/traefik/yaegi/cmd/yaegi/run.go:149 +0x84
main.run(0x140001ba010, 0x1, 0x1, 0x14000186180, 0x14000073ea8)
	github.com/traefik/yaegi/cmd/yaegi/run.go:112 +0x830
main.main()
	github.com/traefik/yaegi/cmd/yaegi/yaegi.go:144 +0x324

Yaegi Version

78d7e85 (master at July 12th 2021)

Additional Notes

With the following packages ~/go/src/sample/d2/d2.go:

package d2

import "sample/d1"

var (
     x := d1.NewT("test")
     F := x.F
)

and ~/go/src/sample/d1/d1.go:

package d1

type T struct { Name string }

func (t *T)F { println(t.Name) }

func NewT(s string) *T { return &T{s} }

This issue is related to #1172.