if fromType.HasShape() {
			// Unified IR uses OCONVIFACE for converting all derived types
			// to interface type. Avoid assertion failure in
			// MarkTypeUsedInInterface, because we've marked used types
			// separately anyway.
		} else {
			reflectdata.MarkTypeUsedInInterface(fromType, ir.CurFunc.LSym)
		}
	}

	if !fromType.IsInterface() {
		typeWord := reflectdata.ConvIfaceTypeWord(base.Pos, n)

			return val.Op() == ir.ONIL
		}

		if val.Type().HasShape() {
			// See comment in cmd/compile/internal/walk/convert.go:walkConvInterface
			return false
		}

		reflectdata.MarkTypeUsedInInterface(val.Type(), l.Linksym())

		var itab *ir.AddrExpr
		if typ.IsEmptyInterface() {
			itab = reflectdata.TypePtrAt(base.Pos, val.Type())
		} else {
			itab = reflectdata.ITabAddrAt(base.Pos, val.Type(), typ)