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Macro definition is feature gated.

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Corey Richardson 2013-12-06 12:10:20 -05:00
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@ -410,7 +410,9 @@ println!("what is this thing: {:?}", mystery_object);
[pf]: http://en.cppreference.com/w/cpp/io/c/fprintf
[fmt]: http://static.rust-lang.org/doc/master/std/fmt/index.html
You can define your own syntax extensions with the macro system. For details, see the [macro tutorial][macros].
You can define your own syntax extensions with the macro system. For details,
see the [macro tutorial][macros]. Note that macro definition is currently
considered an unstable feature.
# Control structures