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Update if-expressions.md (#236)

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* Update if-expressions.md

Adding a note about types of `if` branch blocks.

* Fix typo and simplify.

Co-authored-by: Andrew Walbran <qwandor@google.com>
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Igor Petruk 2023-01-23 12:44:20 +00:00 committed by GitHub
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src/control-flow/if-expressions.md
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@ -25,3 +25,9 @@ fn main() {
};
}
```
<details>
Because `if` is an expression and must have a particular type, both of its branch blocks must have the same type. Consider showing what happens if you add `;` after `x / 2` in the second example.
</details>