I just filed this bug:
#14963: ghci -fdefer-type-errors can't run IO action from another module
https://ghc.haskell.org/trac/ghc/ticket/14963It seems like -fdefer-type-errors and ghci just don't get along at all now.
But on the good news side, ghci reloading a changed module in 8.4.1 is
much much faster than 8.0.2. I don't know who did that, but good
work! Reload being instant instead of having to wait a second or so
makes a big difference.
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