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Diffstat (limited to 'doc/lispref/eval.texi')
| -rw-r--r-- | doc/lispref/eval.texi | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/doc/lispref/eval.texi b/doc/lispref/eval.texi index 88e899de1e8..a45517287b7 100644 --- a/doc/lispref/eval.texi +++ b/doc/lispref/eval.texi @@ -252,11 +252,8 @@ the original symbol. If the contents are another symbol, this process, called @dfn{symbol function indirection}, is repeated until it obtains a non-symbol. @xref{Function Names}, for more information about symbol function indirection. - - One possible consequence of this process is an infinite loop, in the -event that a symbol's function cell refers to the same symbol. -Otherwise, we eventually obtain a non-symbol, which ought to be a -function or other suitable object. +We eventually obtain a non-symbol, which ought to be a function or +other suitable object. @kindex invalid-function More precisely, we should now have a Lisp function (a lambda @@ -332,19 +329,17 @@ or just The built-in function @code{indirect-function} provides an easy way to perform symbol function indirection explicitly. -@defun indirect-function function &optional noerror +@defun indirect-function function @anchor{Definition of indirect-function} This function returns the meaning of @var{function} as a function. If @var{function} is a symbol, then it finds @var{function}'s function definition and starts over with that value. If @var{function} is not a symbol, then it returns @var{function} itself. -This function returns @code{nil} if the final symbol is unbound. It -signals a @code{cyclic-function-indirection} error if there is a loop -in the chain of symbols. +This function returns @code{nil} if the final symbol is unbound. -The optional argument @var{noerror} is obsolete, kept for backward -compatibility, and has no effect. +There is also a second, optional argument that is obsolete and has no +effect. Here is how you could define @code{indirect-function} in Lisp: |