> So can you suggest a patch?

Sure, attaching patch.

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--- runtime/filetype.vim	2014-02-24 23:27:22.000000000 -0800
+++ runtime/filetype.vim	2014-02-24 23:30:42.000000000 -0800
@@ -1014,7 +1014,7 @@
 au BufNewFile,BufRead *.ld			setf ld
 
 " Lex
-au BufNewFile,BufRead *.lex,*.l			setf lex
+au BufNewFile,BufRead *.lex,*.l,*.lxx,*.l++	setf lex
 
 " Libao
 au BufNewFile,BufRead */etc/libao.conf,*/.libao	setf libao
@@ -2405,7 +2405,7 @@
 au BufNewFile,BufRead *.xsl,*.xslt		setf xslt
 
 " Yacc
-au BufNewFile,BufRead *.yy			setf yacc
+au BufNewFile,BufRead *.yy,*.yxx,*.y++		setf yacc
 
 " Yacc or racc
 au BufNewFile,BufRead *.y			call s:FTy()

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