> On Oct 17, 2018, at 10:22 AM, Simon Marlow <marlo...@gmail.com> wrote:
> 
>  but then nothing wil notice if you say {-# TOOL HLNIT ... #-} by mistak

This seems fixable. Any tool can slurp in all `TOOL` (or `X-`, which I prefer) 
pragmas and look for ones that appear to be misspellings. Of course, this 
doesn't stop me from writing a tool named HLNIT and using those pragmas, but 
we'll never be able to guard against that.

Richard
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