It's quite hacky, but this can be done with CPP and quasiquoting (incidentally, it would be _REALLY_ nice if 'undefined' and 'error' had similar source-location-dependent error messages by default):

https://github.com/mokus0/junkbox/commit/bad59f486c3457f1d880a1cfa5b1baa33aff4ade

-- James

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