• Simon Marlow's avatar
    GHCi debugger: new flag -fbreak-on-exception · 17f848e1
    Simon Marlow authored
    When -fbreak-on-exception is set, an exception will cause GHCi to
    suspend the current computation and return to the prompt, where the
    history of the current evaluation can be inspected (if we are in
    :trace).  This isn't on by default, because the behaviour could be
    confusing: for example, ^C will cause a breakpoint.  It can be very
    useful for finding the cause of a "head []" or a "fromJust Nothing",
DynFlags.hs 47.9 KB