guide: function -> closure in explanation of closures
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@ -4223,7 +4223,7 @@ don't need to declare one. This is different from named functions, which
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default to returning unit (`()`).
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default to returning unit (`()`).
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There's one big difference between a closure and named functions, and it's in
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There's one big difference between a closure and named functions, and it's in
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the name: a function "closes over its environment." What's that mean? It means
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the name: a closure "closes over its environment." What's that mean? It means
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this:
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this:
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```{rust}
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```{rust}
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