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Whereas @a..@b parses and transforms to (rcons @a @a),
@(a)..@(a) goes to @(rcons a @(a)).
* parser.l (grammar): Under 248 compatibility or lower, the @
character now produces the OLD_AT token. Otherwise it produces
the '@' character, as before.
* parser.y (OLD_AT): New token replaces the '@' at the old
low precedence position. '@' is now at the highest precedence,
together with OLD_DOTDOT. (We don't care about interactions
between '@' and OLD_DOTDOT, because OLD_DOTDOT only exists in
185 compatibility, in which '@' is OLD_AT).
(meta): The two rules have to be unfortunately duplicated for
OLD_AT, since there is no BNF OR operator in Yacc.
* txr.1: Compat note added.
* lex.yy.c.shipped: Updated.
* y.tab.c.shipped, y.tab.h.shipped: Likewise.
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* Makefile (BS_LIC_FROM, BS_LIC_TO): Variables removed.
(y.tab.c): Remove all filtering hacks. Don't remove the
license from y.tab.c. Don't remove yyparse declaration from
y.tab.h. Provide a pattern rule for producing any missing
file X from X.shipped. That's how y.tab.c and y.tab.h
get produced from y.tab.c.shipped and y.tab.h.shipped,
respectively, in user mode.
* y.tab.c.shipped, y.tab.h.shipped: New files, generated
using Bison 2.5.
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