Implement ${count()} metavariable expression#14878
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Opening as a draft since there are several things I'm uncertain about, but this should be enough to expand well-formed macro calls with |
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Current implementation of rustc has several behaviors I consider a bug or underspecified; see rust-lang/rust#111904, rust-lang/rust#111905. I did implement those behaviors but they are pretty much edge cases and, as I said in my previous comment, we should be able to expand well-defined macros. |
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@bors r+ |
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☀️ Test successful - checks-actions |
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This PR implements
${count()}metavariable expression for MBE as described in RFC 3086. See this section of the RFC for its semantics.Additionally, this PR changes the type of depth parameter of
${index()}from u32 to usize so as to match how rustc parses it.Part of #11952
Fixes #14871