* doc/bison.texinfo (Decl Summary): In the %language entry, mention

that the argument is case-insensitive, and there's no `=' here.
For the %skeleton entry, mention that %language is better.
(Bison Options): Likewise for --language and --skeleton.  Move the
--skeleton entry so that the `Tuning the parser' section is sorted
alphabetically on long options.
(C++ Bison Interface): Don't use the word skeleton.  Don't explain the
%language directive in detail here; cross-reference the %language
documentation instead.
(Calc++ Parser): Use `%require "@value{VERSION}"' rather than
`%require "2.3b"' so that the example is always up-to-date.
(Bison Symbols): Add entries for %language and %skeleton.
* examples/extexi (normalize): Instead of replacing every %require
argument with the current Bison version, just substitute for
`@value{VERSION}'.  This guarantees that we're testing what actually
appears in the documentation.
* examples/calc++/Makefile.am ($(calc_extracted)): Use `$(VERSION)'
rather than `@VERSION@'.

examples/calc++/Makefile.am

@@ -35,7 +35,7 @@ extexi = $(top_srcdir)/examples/extexi
 # Extract in src.
 $(calc_extracted): $(doc) $(extexi)
 	cd $(srcdir) && \
-	   $(AWK) -f ../extexi -v VERSION="@VERSION@" \
+	   $(AWK) -f ../extexi -v VERSION="$(VERSION)" \
 	     ../../doc/bison.texinfo -- calc++-parser.yy \
 	     calc++-scanner.ll calc++.cc calc++-driver.hh calc++-driver.cc
 

examples/extexi

@@ -111,7 +111,7 @@ function normalize(contents,    i, lines, n, line, res) {
 	else
 	  line = "";
 
-      gsub (/^%require "[^"]*"$/, "%require \"" VERSION "\"", line);
+      gsub (/"@value\{VERSION\}"/, "\"" VERSION "\"", line)
       gsub (/^@result\{\}/, "", line);
       gsub (/^@error\{\}/,  "", line);
       gsub ("@[{]", "{", line);