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doc: clarify the destructor selection example

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Reported by Gary L Peskin.
http://lists.gnu.org/archive/html/help-bison/2016-02/msg00000.html

* doc/bison.texi (Destructor Decl): here.
This commit is contained in:
Akim Demaille
2018-08-18 14:09:16 +02:00
parent 5010af94d0
commit 425044a936
2 changed files with 4 additions and 4 deletions
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THANKS
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@@ -56,6 +56,7 @@ Florian Krohm florian@edamail.fishkill.ibm.com
Frank Heckenbach frank@g-n-u.de
Frans Englich frans.englich@telia.com
Gabriel Rassoul gabriel.rassoul@epita.fr
Gary L Peskin garyp@firstech.com
Georg Sauthoff gsauthof@TechFak.Uni-Bielefeld.DE
George Neuner gneuner2@comcast.net
Gilles Espinasse g.esp@free.fr

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doc/bison.texi
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@@ -5072,10 +5072,9 @@ For example:
guarantees that, when the parser discards any user-defined symbol that has a
semantic type tag other than @code{<character>}, it passes its semantic value
to @code{free} by default.
However, when the parser discards a @code{STRING1} or a @code{string1}, it also
prints its line number to @code{stdout}.
It performs only the second @code{%destructor} in this case, so it invokes
@code{free} only once.
However, when the parser discards a @code{STRING1} or a @code{string1},
it uses the third @code{%destructor}, which frees it and
prints its line number to @code{stdout} (@code{free} is invoked only once).
Finally, the parser merely prints a message whenever it discards any symbol,
such as @code{TAGLESS}, that has no semantic type tag.