Fixed #660: Error in luacode nested syntax

after/syntax/tex.vim

@@ -175,12 +175,12 @@ syntax region texZone
       \ keepend
       \ transparent
       \ contains=texBeginEnd,@LUA
-syntax region texZone
-      \ start='\\\(directlua\|luadirect\){'rs=s
-      \ end='}'re=e
-      \ keepend
-      \ transparent
-      \ contains=texBeginEnd,@LUA
+syntax match texStatement '\\\(directlua\|luadirect\)' nextgroup=texZoneLua
+syntax region texZoneLua matchgroup=Delimiter
+      \ start='{'
+      \ end='}'
+      \ contained
+      \ contains=@LUA
 let b:current_syntax = 'tex'
 
 " }}}1

test/features/syntax/test-syntax.tex

@@ -104,6 +104,18 @@ const double pi = 3.1415926535
 \citeyearpar{}
 \bibentry{}
 
+\directlua{
+  if pdf.getminorversion() \string~= 7 then
+    print "pfd version 1.7"
+  end
+}
+
+\begin{luacode}
+  if pdf.getminorversion() \string~= 7 then
+    print "pfd version 1.7"
+  end
+\end{luacode}
+
 \end{document}
 
 % vim: fdl=9