# Aliases for Union{T, Nothing} and Union{T, Missing}?

**URL:** https://discourse.julialang.org/t/aliases-for-union-t-nothing-and-union-t-missing/15402
**Category:** New to Julia
**Created:** [September 24, 2018, 12:03am UTC](https://discourse.julialang.org/t/aliases-for-union-t-nothing-and-union-t-missing/15402 "2018-09-24T00:03:13Z")
**Posts on this page:** 1
**Showing post:** 41

<div class="post-metadata">

### Author: ![tkf](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tkf/32/17635_2.png) [@tkf](https://discourse.julialang.org/u/tkf)
#### Post date: [May 10, 2019, 12:10am UTC](https://discourse.julialang.org/t/aliases-for-union-t-nothing-and-union-t-missing/15402/41 "2019-05-10T00:10:42Z")

</div>

How about `@?Int`?

```julia
ex = :(
    macro _(ex)
        if $(rand() > 0.5)
            :(Union{$ex, Nothing})
        else
            :(Union{$ex, Missing})
        end
    end
)
ex.args[1].args[1] = :?
eval(ex)

@?Int

```

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