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Is the parser undergoing refactoring? #2378

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3 changes: 0 additions & 3 deletions src/macro-expansion.md
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<!-- toc -->

> N.B. [`rustc_ast`], [`rustc_expand`], and [`rustc_builtin_macros`] are all
> undergoing refactoring, so some of the links in this chapter may be broken.

Rust has a very powerful macro system. In the previous chapter, we saw how
the parser sets aside macros to be expanded (using temporary [placeholders]).
This chapter is about the process of expanding those macros iteratively until