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Copying parser/lexer

From: David Kastrup
Subject: Copying parser/lexer
Date: Tue, 08 Nov 2011 11:02:58 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.90 (gnu/linux)


when working on the embedded Scheme stuff I got a nasty surprise working
with cloned lexers/parsers.

They start out with the error flag of their source.

That's stupid, since it means that they can't complete successfully
without explicitly clearing their respective error flags.

I got hit by this since tests complained about every single #{ ... #}
expression when a version error in the main file set the error flag
right at the start of the run.

As we don't clone the parsers for fun (or continuation), I suggest
starting the clones with reset error state right in the copy

If I don't encounter sufficient resistance, I'll likely push a change
like that to dev/staging tomorrow.

David Kastrup

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