doc: discuss try! in std::io#12819
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std::macros::try says to refer to std::io for more information. This patch adds an example of try! when doing I/O. Redo of #12817 following some fumbling with git.
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std::macros::try says to refer to std::io for more information. This patch adds an example of try! when doing I/O.
Redo of #12817 following some fumbling with git.