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Fix description of lexical environment's internals

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* doc/lispref/variables.texi (Lexical Binding): Update the
description of how the lexical environment is represented
internally.  (Bug#62840)
This commit is contained in:
Eli Zaretskii 2023-04-18 14:30:28 +03:00
parent 1456adf424
commit 60560cc7ad
1 changed files with 10 additions and 7 deletions
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doc/lispref/variables.texi
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@ -1183,13 +1183,16 @@ wants the current value of a variable, it looks first in the lexical
environment; if the variable is not specified in there, it looks in
the symbol's value cell, where the dynamic value is stored.
(Internally, the lexical environment is an alist of symbol-value
pairs, with the final element in the alist being the symbol @code{t}
rather than a cons cell. Such an alist can be passed as the second
argument to the @code{eval} function, in order to specify a lexical
environment in which to evaluate a form. @xref{Eval}. Most Emacs
Lisp programs, however, should not interact directly with lexical
environments in this way; only specialized programs like debuggers.)
(Internally, the lexical environment is a list whose members are
usually cons cells that are symbol-value pairs, but some of its
members can be symbols rather than cons cells. A symbol in the list
means the lexical environment declared that symbol's variable as
locally considered to be dynamically bound. This list can be passed
as the second argument to the @code{eval} function, in order to
specify a lexical environment in which to evaluate a form.
@xref{Eval}. Most Emacs Lisp programs, however, should not interact
directly with lexical environments in this way; only specialized
programs like debuggers.)
@cindex closures, example of using
Lexical bindings have indefinite extent. Even after a binding