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Update match-guards.md (#233)

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* Update match-guards.md

Adding more information how match guards are different from simply using "if" inside of the match case, after the case has matched.

* Be consistent about naming of match arms.

Co-authored-by: Andrew Walbran <qwandor@google.com>
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Igor Petruk 2023-01-23 13:09:32 +00:00 committed by GitHub
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src/pattern-matching/match-guards.md
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@ -6,3 +6,14 @@ expression which will be executed if the pattern matches:
```rust,editable
{{#include ../../third_party/rust-by-example/match-guards.rs}}
```
<details>
Match guards as a separate syntax feature are important and necessary. They are not
the same as separate `if` expression inside of the match arm.
An `if` expression inside of the branch block (after `=>`) happens after the match arm
is selected. Failing the `if` condition inside of that block won't result in other arms
of the original `match` expression being considered.
</details>