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Previously, for this special case of an invalid reference, the usual "symbol not found in production:" was printed. However, because the symbol name was parsed as the empty string, that message was followed immediately by a newline instead of a symbol name. In reality, this is a syntax error, so the reference is invalid regardless of the symbols actually appearing in the production. Discussed at <http://lists.gnu.org/archive/html/bison-patches/2011-01/msg00012.html>. * src/scan-code.l (parse_ref): Report the above case as a syntax error. Other than that, continue to handle this case like any other invalid reference that Bison manages to parse because "possibly meant" messages can still be helpful to the user. * tests/named-refs.at ($ or @ followed by . or -): New test group.