and unwind the stack before those errors have a chance to mischief
in the "*" column-name wildcard expander. Fix for ticket [32b63d542433ca67].
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added insurance that parsing will stop quickly after an error. This change
did make the parser stop faster in some cases, which required some revisions
to tests. (CVS 4010)
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cause the tokenizer to abort, but the parser might do several reduce
actions prior to that abort and those reduce actions sometimes need a
valid Expr. (CVS 3980)
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