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Discuss the mutability of the result of quasiquote

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Closes #2403.
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shhyou 2018-12-09 10:28:01 -06:00 committed by shuhung
parent 48cf9e54e3
commit bf8b717ce8
1 changed files with 9 additions and 2 deletions
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11
pkgs/racket-doc/scribblings/reference/syntax.scrbl
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@ -2844,7 +2844,7 @@ and the result of the @racket[_expr] takes the place of the
@racket[(#,unquote-splicing-id _expr)] similarly escapes, but the
@racket[_expr] must produce a list, and its elements are spliced as
multiple values place of the @racket[(#,unquote-splicing-id _expr)], which
must appear as the @racket[car] or a quoted pair, as an element of a
must appear as the @racket[car] of a quoted pair, as an element of a
quoted vector, or as an element of a quoted @tech{prefab} structure;
in the case of a pair, if the @racket[cdr] of the relevant quoted pair
is empty, then @racket[_expr] need not produce a list, and its result
@ -2901,7 +2901,14 @@ and @racket[unquote-splicing] expressions. For example, in
]
a single tail @racket['(2 3)] is used for every evaluation of the
@racket[quasiquote] expression.
@racket[quasiquote] expression. When allocating fresh data,
the @racket[quasiquote] form allocates mutable vectors, mutable boxes
and immutable hashes.
@mz-examples[
(immutable? `#(,0))
(immutable? `#hash((a . ,0)))
]
}