@@ -153,14 +153,9 @@ impl char {
153153/// Basic usage:
154154///
155155/// ```
156- /// let d = '1';
157- ///
158- /// assert!(d.is_digit(10));
159- ///
160- /// let d = 'f';
161- ///
162- /// assert!(d.is_digit(16));
163- /// assert!(!d.is_digit(10));
156+ /// assert!('1'.is_digit(10));
157+ /// assert!('f'.is_digit(16));
158+ /// assert!(!'f'.is_digit(10));
164159/// ```
165160///
166161/// Passing a large radix, causing a panic:
@@ -169,10 +164,8 @@ impl char {
169164/// use std::thread;
170165///
171166/// let result = thread::spawn(|| {
172- /// let d = '1';
173- ///
174167/// // this panics
175- /// d .is_digit(37);
168+ /// '1' .is_digit(37);
176169/// }).join();
177170///
178171/// assert!(result.is_err());
@@ -209,25 +202,15 @@ impl char {
209202/// Basic usage:
210203///
211204/// ```
212- /// let d = '1';
213- ///
214- /// assert_eq!(d.to_digit(10), Some(1));
215- ///
216- /// let d = 'f';
217- ///
218- /// assert_eq!(d.to_digit(16), Some(15));
205+ /// assert_eq!('1'.to_digit(10), Some(1));
206+ /// assert_eq!('f'.to_digit(16), Some(15));
219207/// ```
220208///
221209/// Passing a non-digit results in failure:
222210///
223211/// ```
224- /// let d = 'f';
225- ///
226- /// assert_eq!(d.to_digit(10), None);
227- ///
228- /// let d = 'z';
229- ///
230- /// assert_eq!(d.to_digit(16), None);
212+ /// assert_eq!('f'.to_digit(10), None);
213+ /// assert_eq!('z'.to_digit(16), None);
231214/// ```
232215///
233216/// Passing a large radix, causing a panic:
@@ -236,9 +219,7 @@ impl char {
236219/// use std::thread;
237220///
238221/// let result = thread::spawn(|| {
239- /// let d = '1';
240- ///
241- /// d.to_digit(37);
222+ /// '1'.to_digit(37);
242223/// }).join();
243224///
244225/// assert!(result.is_err());
@@ -463,12 +444,8 @@ impl char {
463444/// Basic usage:
464445///
465446/// ```
466- /// let c = 'a';
467- ///
468- /// assert!(c.is_alphabetic());
469- ///
470- /// let c = '京';
471- /// assert!(c.is_alphabetic());
447+ /// assert!('a'.is_alphabetic());
448+ /// assert!('京'.is_alphabetic());
472449///
473450/// let c = '💝';
474451/// // love is many things, but it is not alphabetic
@@ -522,21 +499,13 @@ impl char {
522499/// Basic usage:
523500///
524501/// ```
525- /// let c = 'a';
526- /// assert!(c.is_lowercase());
527- ///
528- /// let c = 'δ';
529- /// assert!(c.is_lowercase());
530- ///
531- /// let c = 'A';
532- /// assert!(!c.is_lowercase());
533- ///
534- /// let c = 'Δ';
535- /// assert!(!c.is_lowercase());
502+ /// assert!('a'.is_lowercase());
503+ /// assert!('δ'.is_lowercase());
504+ /// assert!(!'A'.is_lowercase());
505+ /// assert!(!'Δ'.is_lowercase());
536506///
537507/// // The various Chinese scripts do not have case, and so:
538- /// let c = '中';
539- /// assert!(!c.is_lowercase());
508+ /// assert!(!'中'.is_lowercase());
540509/// ```
541510#[ stable( feature = "rust1" , since = "1.0.0" ) ]
542511 #[ inline]
@@ -558,21 +527,13 @@ impl char {
558527/// Basic usage:
559528///
560529/// ```
561- /// let c = 'a';
562- /// assert!(!c.is_uppercase());
563- ///
564- /// let c = 'δ';
565- /// assert!(!c.is_uppercase());
566- ///
567- /// let c = 'A';
568- /// assert!(c.is_uppercase());
569- ///
570- /// let c = 'Δ';
571- /// assert!(c.is_uppercase());
530+ /// assert!(!'a'.is_uppercase());
531+ /// assert!(!'δ'.is_uppercase());
532+ /// assert!('A'.is_uppercase());
533+ /// assert!('Δ'.is_uppercase());
572534///
573535/// // The various Chinese scripts do not have case, and so:
574- /// let c = '中';
575- /// assert!(!c.is_uppercase());
536+ /// assert!(!'中'.is_uppercase());
576537/// ```
577538#[ stable( feature = "rust1" , since = "1.0.0" ) ]
578539 #[ inline]
@@ -594,15 +555,12 @@ impl char {
594555/// Basic usage:
595556///
596557/// ```
597- /// let c = ' ';
598- /// assert!(c.is_whitespace());
558+ /// assert!(' '.is_whitespace());
599559///
600560/// // a non-breaking space
601- /// let c = '\u{A0}';
602- /// assert!(c.is_whitespace());
561+ /// assert!('\u{A0}'.is_whitespace());
603562///
604- /// let c = '越';
605- /// assert!(!c.is_whitespace());
563+ /// assert!(!'越'.is_whitespace());
606564/// ```
607565#[ stable( feature = "rust1" , since = "1.0.0" ) ]
608566 #[ inline]
@@ -624,29 +582,14 @@ impl char {
624582/// Basic usage:
625583///
626584/// ```
627- /// let c = '٣';
628- /// assert!(c.is_alphanumeric());
629- ///
630- /// let c = '7';
631- /// assert!(c.is_alphanumeric());
632- ///
633- /// let c = '৬';
634- /// assert!(c.is_alphanumeric());
635- ///
636- /// let c = 'K';
637- /// assert!(c.is_alphanumeric());
638- ///
639- /// let c = 'و';
640- /// assert!(c.is_alphanumeric());
641- ///
642- /// let c = '藏';
643- /// assert!(c.is_alphanumeric());
644- ///
645- /// let c = '¾';
646- /// assert!(!c.is_alphanumeric());
647- ///
648- /// let c = '①';
649- /// assert!(!c.is_alphanumeric());
585+ /// assert!('٣'.is_alphanumeric());
586+ /// assert!('7'.is_alphanumeric());
587+ /// assert!('৬'.is_alphanumeric());
588+ /// assert!('K'.is_alphanumeric());
589+ /// assert!('و'.is_alphanumeric());
590+ /// assert!('藏'.is_alphanumeric());
591+ /// assert!(!'¾'.is_alphanumeric());
592+ /// assert!(!'①'.is_alphanumeric());
650593/// ```
651594#[ stable( feature = "rust1" , since = "1.0.0" ) ]
652595 #[ inline]
@@ -665,11 +608,8 @@ impl char {
665608///
666609/// ```
667610/// // U+009C, STRING TERMINATOR
668- /// let c = '';
669- /// assert!(c.is_control());
670- ///
671- /// let c = 'q';
672- /// assert!(!c.is_control());
611+ /// assert!(''.is_control());
612+ /// assert!(!'q'.is_control());
673613/// ```
674614#[ stable( feature = "rust1" , since = "1.0.0" ) ]
675615 #[ inline]
@@ -687,29 +627,14 @@ impl char {
687627/// Basic usage:
688628///
689629/// ```
690- /// let c = '٣';
691- /// assert!(c.is_numeric());
692- ///
693- /// let c = '7';
694- /// assert!(c.is_numeric());
695- ///
696- /// let c = '৬';
697- /// assert!(c.is_numeric());
698- ///
699- /// let c = 'K';
700- /// assert!(!c.is_numeric());
701- ///
702- /// let c = 'و';
703- /// assert!(!c.is_numeric());
704- ///
705- /// let c = '藏';
706- /// assert!(!c.is_numeric());
707- ///
708- /// let c = '¾';
709- /// assert!(!c.is_numeric());
710- ///
711- /// let c = '①';
712- /// assert!(!c.is_numeric());
630+ /// assert!('٣'.is_numeric());
631+ /// assert!('7'.is_numeric());
632+ /// assert!('৬'.is_numeric());
633+ /// assert!(!'K'.is_numeric());
634+ /// assert!(!'و'.is_numeric());
635+ /// assert!(!'藏'.is_numeric());
636+ /// assert!(!'¾'.is_numeric());
637+ /// assert!(!'①'.is_numeric());
713638/// ```
714639#[ stable( feature = "rust1" , since = "1.0.0" ) ]
715640 #[ inline]
@@ -744,13 +669,10 @@ impl char {
744669/// Basic usage:
745670///
746671/// ```
747- /// let c = 'C';
748- ///
749- /// assert_eq!(c.to_lowercase().next(), Some('c'));
672+ /// assert_eq!('C'.to_lowercase().next(), Some('c'));
750673///
751674/// // Japanese scripts do not have case, and so:
752- /// let c = '山';
753- /// assert_eq!(c.to_lowercase().next(), Some('山'));
675+ /// assert_eq!('山'.to_lowercase().next(), Some('山'));
754676/// ```
755677#[ stable( feature = "rust1" , since = "1.0.0" ) ]
756678 #[ inline]
@@ -781,12 +703,10 @@ impl char {
781703/// Basic usage:
782704///
783705/// ```
784- /// let c = 'c';
785- /// assert_eq!(c.to_uppercase().next(), Some('C'));
706+ /// assert_eq!('c'.to_uppercase().next(), Some('C'));
786707///
787708/// // Japanese does not have case, and so:
788- /// let c = '山';
789- /// assert_eq!(c.to_uppercase().next(), Some('山'));
709+ /// assert_eq!('山'.to_uppercase().next(), Some('山'));
790710/// ```
791711///
792712/// In Turkish, the equivalent of 'i' in Latin has five forms instead of two:
@@ -797,19 +717,15 @@ impl char {
797717/// Note that the lowercase dotted 'i' is the same as the Latin. Therefore:
798718///
799719/// ```
800- /// let i = 'i';
801- ///
802- /// let upper_i = i.to_uppercase().next();
720+ /// let upper_i = 'i'.to_uppercase().next();
803721/// ```
804722///
805723/// The value of `upper_i` here relies on the language of the text: if we're
806724/// in `en-US`, it should be `Some('I')`, but if we're in `tr_TR`, it should
807725/// be `Some('İ')`. `to_uppercase()` does not take this into account, and so:
808726///
809727/// ```
810- /// let i = 'i';
811- ///
812- /// let upper_i = i.to_uppercase().next();
728+ /// let upper_i = 'i'.to_uppercase().next();
813729///
814730/// assert_eq!(Some('I'), upper_i);
815731/// ```
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