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Update types-union.md 
added indicator that this is scala3 only for those new to scala
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@Randle-Lanre
Randle-Lanre authored Apr 10, 2023
commit 0c8a6664382ea07f673d9b8c3c231856ee81b7f8
1 change: 1 addition & 0 deletions _overviews/scala3-book/types-union.md
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Expand Up @@ -7,6 +7,7 @@ num: 51
previous-page: types-intersection
next-page: types-adts-gadts
---
Scala 3 only

Used on types, the `|` operator creates a so-called _union type_.
The type `A | B` represents values that are **either** of the type `A` **or** of the type `B`.
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