{"action":"created","comment":{"url":"https://api.github.com/repos/rust-lang/rust-by-example/pulls/comments/232456726","pull_request_review_id":173665989,"id":232456726,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIzMjQ1NjcyNg==","diff_hunk":"@@ -39,3 +39,6 @@ Output:\n This was a very simple example, but much more complex interfaces have been\n developed, such as [`lazy_static`](https://crates.io/crates/lazy_static) or\n [`clap`](https://crates.io/crates/clap).\n+\n+Also, note the two pairs of braces in the macro. The outer ones are\n+part of the syntax of `macro_rules!`, in addition to `()` or 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is a little confusing to me – which \"macro\" are you referring to here? what is the \"outer 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