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fix code sample

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Luke Boswell 2023-02-07 18:52:31 +11:00
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14
www/generate_tutorial/src/input/tutorial.md
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@ -1012,17 +1012,17 @@ Roc enables information hiding through an *opaque type* language feature. To def
Lets see how to create an opaque type; suppose we define the following inside the `Username` module:
```elm
Username := Str
<pre><samp>
Username <span class="colon">:=</span> Str
fromStr : Str -> Username
fromStr = \str ->
fromStr <span class="colon">:</span> Str <span class="kw">-></span> Username
fromStr <span class="kw">=</span> <span class="kw">\</span>str <span class="kw">-></span>
@Username str
toStr : Username -> Str
toStr = \@Username str ->
toStr <span class="colon">:</span> Username <span class="kw">-></span> Str
toStr <span class="kw">=</span> <span class="kw">\</span>@Username str <span class="kw">-></span>
str
```
</pre></samp>
Here, `Username` is an opaque type. The `fromStr` function turns a string into a `Username` by *calling* `@Username` on that string. The `toStr` function turns a `Username` back into a string by pattern matching `@Username str ->` to unwrap the string from the `Username`.