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doc: Add unquote and unquote-splicing examples.

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Suggested by Vincent Legoll <vincent.legoll@gmail.com>.

* doc/ref/api-evaluation.texi (Expression Syntax): Add an unquote and an
unquote-splicing example.
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Ludovic Courtès 2016-07-22 16:39:12 +02:00 • committed by Andy Wingo
parent 0cf155be72
commit ad7e806a9f
1 changed files with 3 additions and 1 deletions
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4
doc/ref/api-evaluation.texi
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@ -136,6 +136,7 @@ an expression to be evaluated and inserted. The comma syntax @code{,}
is simply a shorthand for an @code{unquote} form. For example,
@example
`(1 2 (* 9 9) 3 4) @result{} (1 2 (* 9 9) 3 4)
`(1 2 ,(* 9 9) 3 4) @result{} (1 2 81 3 4)
`(1 (unquote (+ 1 1)) 3) @result{} (1 2 3)
`#(1 ,(/ 12 2)) @result{} #(1 6)
@ -153,8 +154,9 @@ the returned list inserted. @var{expr} must evaluate to a list. The
@example
(define x '(2 3))
`(1 ,x 4) @result{} (1 (2 3) 4)
`(1 ,@@x 4) @result{} (1 2 3 4)
`(1 (unquote-splicing (map 1+ x))) @result{} (1 3 4)
`(1 (unquote-splicing (map 1+ x))) @result{} (1 3 4)
`#(9 ,@@x 9) @result{} #(9 2 3 9)
@end example