rollup merge of #17278 : steveklabnik/gh17242
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@ -185,8 +185,8 @@ Next up is this line:
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This line does all of the work in our little program. There are a number of
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details that are important here. The first is that it's indented with four
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spaces, not tabs. Please configure your editor of choice to insert four spaces
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with the tab key. We provide some sample configurations for various editors
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[here](https://github.com/rust-lang/rust/tree/master/src/etc).
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with the tab key. We provide some [sample configurations for various
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editors](https://github.com/rust-lang/rust/tree/master/src/etc).
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The second point is the `println!()` part. This is calling a Rust **macro**,
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which is how metaprogramming is done in Rust. If it were a function instead, it
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