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* doc/bison.texinfo (Mid-Rule Actions): Mention that periods and dashes make symbol names less convenient for named references. * src/scan-code.l: (handle_action_dollar): New arg textlen. All callers changed. (handle_action_at): Likewise. Also, args are pointers to const. (ref_tail_fields): Remove; no longer used. (letter): Now includes '-' and '.', since this is for Bison identifiers. (id): Now the simpler traditional defn, since letters now include '-' and '.'. (c_letter, c_id): New defns. (ref): Use c_id for unbracketed IDs. (<SC_RULE_ACTION>): Simplify, now that the distinction between Bison and unbracketed IDs are now in the regular expressions. (VARIANT_BAD_BRACKETING): Remove. (VARIANT_NOT_VISIBLE_FROM_MIDRULE): Renumber. (find_prefix_end): Remove, replacing with .... (identifier_matches): New function. (variant_add): Use it. Omit EXPLICIT_BRACKETING arg; no longer needed. CP arg is pointer to constant. All callers changed. (show_sub_messages): Remove args CP, EXPLICIT_BRACKETING, DOLLAR_OR_AT. New arg TEXT. All callers changed. Do not worry about showing trailing context. (parse_ref): Args CP, RULE, TEXT are now pointers to const. New arg TEXTLEN. Remove arg DOLLAR_OR_AT. All callers changed. Simplify code now that the regular expressions capture the restrictions. * src/scan-gram.l (letter, id): Adjust to match scan-code.l. * src/symlist.c (symbol_list_null): Arg is now pointer to const. * src/symlist.h: Likewise. * tests/named-refs.at (Misleading references): These are now caught by the C compiler, not by Bison; that's good enough. Adjust test to reflect this. (Many kinds of errors, Unresolved references): Adjust expected diagnostics to match new behavior. The same errors are caught, though the diagnostics are not quite as fancy. ($ or @ followed by . or -): Likewise. Also, Make the grammar unambiguous, so that diagnostics are not complicated by ambiguity warnings.