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docs: fix variable name. (#533)

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Dan Barowy 2020-11-03 16:58:23 +00:00 committed by GitHub
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book/README.md
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@ -39,7 +39,7 @@ gitbook:examples $ c++ -std=c++11 intro.cpp
Much more complicated options are handled elegantly:
```cpp
std::string req_real_file;
std::string file;
app.add_option("-f,--file", file, "Require an existing file")
->required()
->check(CLI::ExistingFile);