for k, t := range fieldtypes {
		if t == nil {
			panic("bad -- field has no type")
		}
		f := types.NewField(src.NoXPos, nil, t)
		fields[k] = f
	}
	s := types.NewStruct(fields)
	return s
}

func mkFuncType(rcvr *types.Type, ins []*types.Type, outs []*types.Type) *types.Type {
	q := typecheck.Lookup("?")
	inf := []*types.Field{}
	for _, it := range ins {
		inf = append(inf, mkParamResultField(it, q, ir.PPARAM))
	}