Rollup merge of #40499 - ericfindlay:master, r=steveklabnik
Corrected very minor documentation detail about Unicode and Japanese Japanese half-width and full-width romaji characters do have upper and lowercase according Unicode (but other Japanese characters do not). For example, ` assert_eq!('\u{FF21}'.to_lowercase().collect::<String>(),"\u{FF41}");` r? @steveklabnik
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e389f6a67e
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@ -829,7 +829,8 @@ impl char {
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/// // Sometimes the result is more than one character:
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/// assert_eq!('İ'.to_lowercase().to_string(), "i\u{307}");
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///
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/// // Japanese scripts do not have case, and so:
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/// // Characters that do not have both uppercase and lowercase
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/// // convert into themselves.
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/// assert_eq!('山'.to_lowercase().to_string(), "山");
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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@ -889,7 +890,8 @@ impl char {
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/// // Sometimes the result is more than one character:
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/// assert_eq!('ß'.to_uppercase().to_string(), "SS");
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///
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/// // Japanese does not have case, and so:
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/// // Characters that do not have both uppercase and lowercase
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/// // convert into themselves.
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/// assert_eq!('山'.to_uppercase().to_string(), "山");
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/// ```
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///
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