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%destructor can leak the lookahead

From: Akim Demaille
Subject: %destructor can leak the lookahead
Date: Thu, 02 Sep 2004 16:23:34 +0200
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux)

There is one case where %destructor is not triggered, but it should:
when the error recovery just aborts when we were popping the stack and
we reach its bottom.

One way to fix this leak is to just add a destructor call right
there.  Another would be to put this destructor call into yyabortlab.
That would imply:

- yydestruct can be called on EOF
  So what?  It should not be defined, and if the user meant to define
  it, there could be good reasons.

- yydestruct is called on the lookahead if the user explicitly calls

Because of this last reason, I'm tempted to release the lookahead at

What do you think?

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