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Clarify there is no special meaning to else in match.

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Closes #1005.
This commit is contained in:
Alex Shinn 2024-10-09 07:16:41 +09:00
parent 25a5534584
commit be31278685
1 changed files with 6 additions and 1 deletions
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7
lib/chibi/match/match.scm
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@ -32,6 +32,11 @@
;;> If no patterns match an error is signalled. ;;> If no patterns match an error is signalled.
;;> Note there is no \scheme{else} clause. \scheme{else} is sometimes
;;> used descriptively for the last pattern, since an identifier used
;;> only once matches anything, but it's preferred to use \scheme{_}
;;> described below.
;;> Identifiers will match anything, and make the corresponding ;;> Identifiers will match anything, and make the corresponding
;;> binding available in the body. ;;> binding available in the body.
@ -128,7 +133,7 @@
;;> are bound if the \scheme{or} operator matches, but the binding is ;;> are bound if the \scheme{or} operator matches, but the binding is
;;> only defined for identifiers from the subpattern which matched. ;;> only defined for identifiers from the subpattern which matched.
;;> \example{(match 1 ((or) #t) (else #f))} ;;> \example{(match 1 ((or) #t) (_ #f))}
;;> \example{(match 1 ((or x) x))} ;;> \example{(match 1 ((or x) x))}
;;> \example{(match 1 ((or x 2) x))} ;;> \example{(match 1 ((or x 2) x))}