convert a function to another type

[mvertes]

The following program sample.go triggers a panic:

package main

type T struct {
    v int 
}

type comparator func(T, T) bool

func sort(items []T, comp comparator) {
    println("in sort")
}

func compT(t0, t1 T) bool { return t0.v < t1.v }

func main() {
    a := []T{}
    sort(a, comparator(compT))
}

Expected result:

$ go run ./sample.go
in sort

Got:

$ yaegi ./sample.go
./sample.go:17:10: panic
run: reflect.Set: value of type func(struct { Xv int }, struct { Xv int }) bool is not assignable to type *interp.node
goroutine 1 [running]:
runtime/debug.Stack(0x1, 0xc000186a00, 0x40)
        /usr/lib/go/src/runtime/debug/stack.go:24 +0x9f
github.com/traefik/yaegi/interp.(*Interpreter).eval.func1(0xc000219c70)
        /home/marc/go/src/github.com/traefik/yaegi/interp/interp.go:480 +0xc5
panic(0xdceac0, 0xc0001bf220)
        /usr/lib/go/src/runtime/panic.go:969 +0x1b9
github.com/traefik/yaegi/interp.runCfg.func1(0xc0001ce820, 0xc000482900, 0xc000219a60)
        /home/marc/go/src/github.com/traefik/yaegi/interp/run.go:171 +0x247
panic(0xdceac0, 0xc0001bf220)
        /usr/lib/go/src/runtime/panic.go:969 +0x1b9
reflect.Value.assignTo(0xc000137080, 0xc000405a10, 0x13, 0xf087a3, 0xb, 0xea6680, 0x0, 0xc000137080, 0xc000480c00, 0x0)
        /usr/lib/go/src/reflect/value.go:2425 +0x405
reflect.Value.Set(0xea6680, 0xc0001348d8, 0x196, 0xc000137080, 0xc000405a10, 0x13)
        /usr/lib/go/src/reflect/value.go:1554 +0xbd
github.com/traefik/yaegi/interp.convert.func3(0xc0001ce820, 0xc0001dcc00)
        /home/marc/go/src/github.com/traefik/yaegi/interp/run.go:418 +0x1ce
github.com/traefik/yaegi/interp.runCfg(0xc000482900, 0xc0001ce820)
        /home/marc/go/src/github.com/traefik/yaegi/interp/run.go:177 +0x87
github.com/traefik/yaegi/interp.(*Interpreter).run(0xc00037e000, 0xc000482100, 0xc0001ce780)
        /home/marc/go/src/github.com/traefik/yaegi/interp/run.go:108 +0x2af
github.com/traefik/yaegi/interp.(*Interpreter).eval(0xc00037e000, 0xc00010c900, 0xf2, 0x7ffd515665c3, 0x19, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
        /home/marc/go/src/github.com/traefik/yaegi/interp/interp.go:572 +0x809
github.com/traefik/yaegi/interp.(*Interpreter).EvalPath(0xc00037e000, 0x7ffd515665c3, 0x19, 0xc00010c800, 0xf2, 0x0, 0x0, 0xc00019bba0)
        /home/marc/go/src/github.com/traefik/yaegi/interp/interp.go:394 +0xfa
main.runFile(0xc00037e000, 0x7ffd515665c3, 0x19, 0xc000136de0, 0x1)
        /home/marc/go/src/github.com/traefik/yaegi/cmd/yaegi/run.go:123 +0xae
main.run(0xc000128030, 0x1, 0x1, 0x13, 0x13)
        /home/marc/go/src/github.com/traefik/yaegi/cmd/yaegi/run.go:89 +0x7e5
main.main()
        /home/marc/go/src/github.com/traefik/yaegi/cmd/yaegi/yaegi.go:144 +0x415