Merge pull request #2378 from smanilov/patch-7
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<!-- toc -->
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> N.B. [`rustc_ast`], [`rustc_expand`], and [`rustc_builtin_macros`] are all
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> undergoing refactoring, so some of the links in this chapter may be broken.
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Rust has a very powerful macro system. In the previous chapter, we saw how
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the parser sets aside macros to be expanded (using temporary [placeholders]).
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This chapter is about the process of expanding those macros iteratively until
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