Improve error messages for `$' or `@' followed by `.' or `-'.

[bison.git] / ChangeLog

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+2011-01-09  Joel E. Denny  <joeldenny@joeldenny.org>
+
+       Improve error messages for `$' or `@' followed by `.' or `-'.
+       Previously, for this special case of an invalid reference, the
+       usual "symbol not found in production:" was printed.  However,
+       because the symbol name was parsed as the empty string, that
+       message was followed immediately by a newline instead of a symbol
+       name.  In reality, this is a syntax error, so the reference is
+       invalid regardless of the symbols actually appearing in the
+       production.  Discussed at
+       <http://lists.gnu.org/archive/html/bison-patches/2011-01/msg00012.html>.
+       * src/scan-code.l (parse_ref): Report the above case as a syntax
+       error.  Other than that, continue to handle this case like any
+       other invalid reference that Bison manages to parse because
+       "possibly meant" messages can still be helpful to the user.
+       * tests/named-refs.at ($ or @ followed by . or -): New test group.
+
 2011-01-08  Joel E. Denny  <joeldenny@joeldenny.org>
 
        doc: don't use @acronym.