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-- We have this structure of modules:
-- A (imports B.boot)
-- B (imports A)
-- B.boot (imports A)
-- C (imports A and B)
-- And we load C, to debug some function in A which enters B.
-- But first we touch A, and reload. B.boot will be reloaded, but not B, which will end up with an empty modbreaks. When we :step into B, ghci will die with an out of bounds access in B's break array.
-- The effect we want is B.boot being reloaded while B is not.
:l C
:! touch A.hs
:r
:break a
a ()
:st
:st
:st -- here we step into B, and produce the exception
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