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* etc/NEWS: Fix wording of a recently-added item. * doc/lispref/functions.texi (Declare Form): Fix markup.
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@ -2725,22 +2725,22 @@ Here's an example of using @code{type} inside @code{declare} to declare
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a function @code{positive-p} that takes an argument of type @var{number}
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and return a @var{boolean}:
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@group
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@lisp
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@group
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(defun positive-p (x)
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(declare (type (function (number) boolean)))
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(when (> x 0)
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t))
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@end lisp
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@end group
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@end lisp
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Similarly this declares a function @code{cons-or-number} that: expects a
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first argument being a @var{cons} or a @var{number}, a second optional
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argument of type @var{string} and return one of the symbols
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@code{is-cons} or @code{is-number}:
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@group
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@lisp
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@group
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(defun cons-or-number (x &optional err-msg)
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(declare (type (function ((or cons number) &optional string)
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(member is-cons is-number))))
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@ -2749,11 +2749,10 @@ argument of type @var{string} and return one of the symbols
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(if (numberp x)
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'is-number
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(error (or err-msg "Unexpected input")))))
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@end lisp
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@end group
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@end lisp
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More types are described in the Lisp Data Types chapter (@ref{Lisp Data
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Types}).
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For description of additional types, see @ref{Lisp Data Types}).
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Declaring a function with an incorrect type produces undefined behavior
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and could lead to unexpected results or might even crash Emacs when code
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6
etc/NEWS
6
etc/NEWS
@ -1940,9 +1940,9 @@ unibyte string.
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* Lisp Changes in Emacs 30.1
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+++
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** Function type declaration
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It is now possible, using the 'declare' macro, to declare expected types
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of function arguments and return type.
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** Function type declaration.
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It is now possible to declare the expected type of a function's
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arguments and its return type using the 'declare' macro.
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** New types 'closure' and 'interpreted-function'.
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'interpreted-function' is the new type used for interpreted functions,
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