I wish I knew enough about grammars and highlighters to fix this myself, but instead I'm creating an issue, sorry.

@jaredly's let-anything PPX seems to break syntax highlighting on most elements after its use, as you can see above in the pasted screenshot. Modules still work, but other identifiers don't.
We've started using the PPX so much that it's really be nice to find a fix for this. Any idea why it's happening, or direction toward how I could start fixing it?