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A bullet-proof method is impossible, but basic jumps from someverb=: verb define to ) etc. should be easy.

Steve Losh has a tutorial at http://learnvimscriptthehardway.stevelosh.com/chapters/51.html.

Hrm. What was I thinking?

With :set foldmethod=syntax explicit definitions should be folded away.

This is trivial for explicit verbs/adverbs/conjunctions: just add fold.

For explicit nouns, however, this doesn't work, because an explicit noun definition is split into two syntax regions. I don't know a good solution yet.

The settings

setlocal shiftwidth=2
setlocal softtabstop=2
setlocal expandtab

perhaps shouldn't be set in the ftplugin. Many good-quality filetype plugins don't set the ts/sts/sw/et settings, and they are probably right. As it is, the user would have to override these settings in an after file.

Some good filetype plugins do set these settings, but they do so in the indent file.

Things like monad, define, etc., and standard library string functions etc. etc. are not highlighted.

Technically, these things have no special status in the language. They can be redefined or overwritten by the user at any time. But of course, people should not normally overwrite standard library stuff, and if they do, it is probably in error. Highlighting would help here.

Fractions of pi like 1r2p1 (π/2) aren't highlighted correctly.

Apparently I overlooked these when I composed the super complicated number regexp. Fractions of pi aren't so rare. For example, they are useful when doing calculations in radians, 1r2p1 1p1 3r2p1 2p1.