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add link for string to as_ref docs
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@ -615,6 +615,7 @@ impl<T> Option<T> {
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///
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/// [`map`]: Option::map
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/// [String]: ../../std/string/struct.String.html "String"
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/// [`String`]: ../../std/string/struct.String.html "String"
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///
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/// ```
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/// let text: Option<String> = Some("Hello, world!".to_string());
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