ch8: wraperror2: remove map_err() call #100
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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.
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To match the book text (Listing 8.15, which is supposed to match
ch8/misc/wraperror2.rs), actually remove themap_err()calls that are not supposed to be needed once thestd::convert::Fromtrait is implemented for the wrapped types.Without this change, the difference between
wraperror.rsandwraperror2.rsis not particularly obvious, as thestd::convert::Fromtraits are unnecessary. (The code does compile without this change, because the in repository implementation is basically the same asch8/misc/wraperror.rs.)ETA: Force pushed a replacement to fix typo in commit comment that I noticed while editing the PR text.