Actually I now think that not only are top level TWIs okay, I can
get extra contexts by rewriting the MVar module. Here I can
create a TWI in the new MVar module called context, and all
mvar writes and reads would be parameterised by context. In
this way I can change the context then call oneShot and
get it to run a second (or as many times as I like)...
So that gets round my last remaining objection to top level
MVars. This also shows that top level TWIs and the Execution
contexts are effectively the same thing... but I guess TWIs
have a nicer syntax...
Keean.
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