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[Andrew Martin]

To get GHC to raise an exception from an inline primop, I presume that I'd
need to jump to stg_raisezh. None of the existing inline primops do
anything quite like this. I see things like emitMemcmpCall and
emitMemsetCall, but these ultimately just wrap emitForeignCall, which wraps
mkUnsafeCall, which wraps the data constructor CmmUnsafeForeignCall. I
think I want CmmCall instead, which is described by the comments as being
used for "a native call or tail call". Hmm... emitRtsCall might be what I
want. I'll try pursuing this route further.

-- 
-Andrew Thaddeus Martin
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