This syntax file highlights ragel files with real highlighting for the host language.
If the host language's highlighter uses ALL or ALLBUT (I'm looking at you, c.vim), this will cause some ragel highlighting rules to leak into the outer code. A hack to fix this is:
sudo sed -i 's/ALLBUT|ALL/TOP/g' /usr/share/vim/vimcurrent/syntax/$host.vim
If anyone has tips on how to fix this in ragel.vim (other than reading the host syntax file and using substitute()), please let me know.