conversion to interface at return

[mvertes]

The following program sample.go triggers an unexpected result

package main

type I interface {
    F()
}

type T struct {
    Name string
}

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

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

func NewI(s string) I { return newT(s) }

func main() {
    i := NewI("test")
    i.F()
}

Expected result

$ go run ./sample.go
in F test

Got

$ yaegi ./sample.go
./sample.go:19:2: panic
./sample.go:19:2: panic
run: reflect.Set: value of type interp.valueInterface is not assignable to type *struct { Name string }
goroutine 1 [running]:
runtime/debug.Stack(0x1, 0x14000302a00, 0x40)
	runtime/debug/stack.go:24 +0x88
github.com/traefik/yaegi/interp.(*Interpreter).eval.func1(0x14000247bf0)
	github.com/traefik/yaegi/interp/interp.go:503 +0x94
panic(0x100e8df00, 0x14000233350)
	runtime/panic.go:965 +0x14c
github.com/traefik/yaegi/interp.runCfg.func1(0x140001de790, 0x140004d3200, 0x140002479c0)
	github.com/traefik/yaegi/interp/run.go:185 +0x1e8
panic(0x100e8df00, 0x14000233350)
	runtime/panic.go:965 +0x14c
github.com/traefik/yaegi/interp.runCfg.func1(0x140001de840, 0x140004d2700, 0x14000247780)
	github.com/traefik/yaegi/interp/run.go:185 +0x1e8
panic(0x100e8df00, 0x14000233350)
	runtime/panic.go:965 +0x14c
reflect.Value.assignTo(0x100f107c0, 0x140001c32e0, 0x99, 0x100caa2df, 0xb, 0x140002f8840, 0x0, 0x140001c32e0, 0xef6ee0d46ab20e00, 0x140001c32e0)
	reflect/value.go:2451 +0x2d0
reflect.Value.Set(0x140002f8840, 0x140001be968, 0x196, 0x100f107c0, 0x140001c32e0, 0x99)
	reflect/value.go:1564 +0x94
github.com/traefik/yaegi/interp.call.func3(0x140001de840, 0x140001de8f0, 0x4, 0x140001c0fc0)
	github.com/traefik/yaegi/interp/run.go:1122 +0x174
github.com/traefik/yaegi/interp.call.func7(0x140001de840, 0x14000233320)
	github.com/traefik/yaegi/interp/run.go:1200 +0x2a4
github.com/traefik/yaegi/interp.runCfg(0x140004d2700, 0x140001de840)
	github.com/traefik/yaegi/interp/run.go:191 +0x8c
github.com/traefik/yaegi/interp.call.func7(0x140001de790, 0x100f69220)
	github.com/traefik/yaegi/interp/run.go:1280 +0xa20
github.com/traefik/yaegi/interp.runCfg(0x140004d3200, 0x140001de790)
	github.com/traefik/yaegi/interp/run.go:191 +0x8c
github.com/traefik/yaegi/interp.(*Interpreter).run(0x14000384000, 0x140004d2a00, 0x140001de6e0)
	github.com/traefik/yaegi/interp/run.go:122 +0x244
github.com/traefik/yaegi/interp.(*Interpreter).eval(0x14000384000, 0x1400018c700, 0xf3, 0x16f9a37d6, 0x1e, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	github.com/traefik/yaegi/interp/interp.go:595 +0x5e8
github.com/traefik/yaegi/interp.(*Interpreter).EvalPath(0x14000384000, 0x16f9a37d6, 0x1e, 0x1400018c600, 0xf3, 0x0, 0x0, 0x0)
	github.com/traefik/yaegi/interp/interp.go:417 +0xc4
main.runFile(0x14000384000, 0x16f9a37d6, 0x1e, 0x0, 0x0, 0x0)
	github.com/traefik/yaegi/cmd/yaegi/run.go:149 +0x84
main.run(0x140001c2010, 0x1, 0x1, 0x14000182480, 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

v0.9.19

Additional Notes

related to #1172 (after applying #1174, #1176, #1178)