R. David Murray added the comment:

I'm don't have a lot of experience with parsers, but I suspect that we consider 
the cost of making the grammar more complex to be more significant than the 
benefit we'd get from catching these at compile time.  And as Vedran says, 
defining what can be caught without breaking legitimate things is distinctly 
non-trivial.

I vote to just close this issue.  If you come up with a proposal we can reopen.

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nosy: +r.david.murray

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