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ch8: wraperror2: remove map_err() call #100

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ch8: wraperror2: remove map_err() call #100

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Commits on Jan 10, 2023

  1. ch8: wraperror2: remove map_err() call 

    To match the book text (Listing 8.15, which is supposed to match
ch8/misc/wraperror2.rs), actually remove the map_err() calls that
are not supposed to be needed once the std::convert::From trait
is implemented for the wrapped types.
    @ewenmcneill
    ewenmcneill committed Jan 10, 2023
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