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* parser.y (elem): When the elem is a list, if it starts with mdo, then
we evaluate it immediately and substitute (do) as the semantic
value. We no longer not allow mdo to precipitate into
match_expand_elem, where expand_meta will be unleashed on it.
Doing so causes the bug that expessions like @1, denoting
the form (sys:var 1), are rewritten to (sys:expr 1), which op
syntax. So two bugs are fixed: the incorrect treatment of
meta-syntax, and the neglect to perform mdo in nested
contexts.
(check_parse_time_action): We need not handle mdo here any
more; it will never make it into this function.
Only actions done in the main clause list belong here,
not parse time actions done at any nesting level.
* tests/008/mdo.txr: New file.
* y.tab.c.shipped: Updated.
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