Can't create []<func type> with a slice of <the function types>

[theclapp]

(Yaegi issue.)

See https://github.com/gioui/gio-example/blob/d6ec266262f41bfc815c4c7bea0f33a2468f9167/kitchen/kitchen.go#L245

	widgets := []layout.Widget{
		material.H3(th, topLabel).Layout,
		func(gtx C) D {
			gtx.Constraints.Max.Y = gtx.Px(unit.Dp(200))
			return material.Editor(th, editor, "Hint").Layout(gtx)
		},
		// ...

layout.Widget is type Widget func(gtx Context) Dimensions

The first Layout might actually work?

The second definitely breaks: Eval error: 40:56: cannot use type as type gioui.org/layout.Widget. Note the type<space><space>as type....