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unexpected runtime crash

Apologies for the poor summary, I'm not sure how to be more descriptive. I don't see anything dodgy here.

Compiling the attached program ghc -O -dcore-lint Test.hs and running it results in a runtime crash. Various incarnations of this code have resulted in

    Test: internal error: scavenge_one: strange object 0
    Test: internal error: stg_ap_p_ret

and core dumps with no further information.

I've been able to reproduce this with ghc-7.8.2 and ghc-7.6.3.

Edited by Simon Peyton Jones
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