master: lalr1.cc: also handle syntax_error when calling yylex

[Akim Demaille]

To be installed in master.  I've been using this for
a while.  I have not measured the cost of the exception
handling in the scanner (as opposed to relying on, for
instance, the return value of the functions called in the
scanner), but it is *much* more maintainable.

0007-lalr1.cc-also-handle-syntax_error-when-calling-yylex.patch
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