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:l shell.hs
:def shell (\s -> do shell s; return "")
-- 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 called b in B.
-- But first we touch A, and reload. B.boot will be reloaded, but not B, which will end up with an empty modbreaks. We can no longer set a breakpoint in B.b
-- The effect we want is B.boot being reloaded while B is not.
:shell cp A1.hs A.hs
:l C
:break b -- it works ok at this point
:shell echo >> A.hs
:r
:break b -- it does not work anymore
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