d: remove dead comment

* data/skeletons/lalr1.d (reportSyntaxError): here.

data/skeletons/lalr1.d

@@ -677,37 +677,6 @@ m4_popdef([b4_at_dollar])])dnl
 [custom], [[
     yylexer.syntax_error(yyctx);]],
 [detailed\|verbose], [[
-    /* There are many possibilities here to consider:
-       - Assume YYFAIL is not used.  It's too flawed to consider.
-         See
-         <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
-         for details.  YYERROR is fine as it does not invoke this
-         function.
-       - If this state is a consistent state with a default action,
-         then the only way this function was invoked is if the
-         default action is an error action.  In that case, don't
-         check for expected tokens because there are none.
-       - The only way there can be no lookahead present (in tok) is
-         if this state is a consistent state with a default action.
-         Thus, detecting the absence of a lookahead is sufficient to
-         determine that there is no unexpected or expected token to
-         report.  In that case, just report a simple "syntax error".
-       - Don't assume there isn't a lookahead just because this
-         state is a consistent state with a default action.  There
-         might have been a previous inconsistent state, consistent
-         state with a non-default action, or user semantic action
-         that manipulated yychar.  (However, yychar is currently out
-         of scope during semantic actions.)
-       - Of course, the expected token list depends on states to
-         have correct lookahead information, and it depends on the
-         parser not to perform extra reductions after fetching a
-         lookahead from the scanner and before detecting a syntax
-         error.  Thus, state merging (from LALR or IELR) and default
-         reductions corrupt the expected token list.  However, the
-         list is correct for canonical LR with one exception: it
-         will still contain any token that will not be accepted due
-         to an error action in a later state.
-      */
     if (yyctx.getToken() != ]b4_symbol(empty, kind)[)
     {
       // FIXME: This method of building the message is not compatible