tlborm

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`${count(ident)}` is not equivalent to `${count(ident, 0)}`

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> `${count(ident)}`: The number of times `$ident` repeats in the inner-most repetition in total. This is equivalent to `${count(ident, 0)}`. refer to: https://github.com/rust-lang/rust/issues/83527#issuecomment-1070860171

zjp-CN

Veykril

It is not well described in the book as it stands right now

Veykril

see https://github.com/rust-lang/rust/pull/95860#issuecomment-1097101601

Veykril

Lookahead and lookback

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I haven't looked into this too much yet, but if I am not mistaken the `quote` crate uses a neat trick to allow lookahead and lookback-ish matching on tokens, see:...

Veykril

and how they differ from lazy ones

Veykril

Procedural Macros

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I believe it would be a nice addition to also cover procedural macros effectively turning the little book into a bigger book. This will most likely require a bit of...

Veykril

Rewrite the SyntaxExtension/Hygiene chapter

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It's really not great atm but I'm currently having trouble going into the topic without touching macro_rules!/proc-macro specifics, https://veykril.github.io/tlborm/syntax-extensions/hygiene.html Basically after https://github.com/Veykril/tlborm/pull/43 lands, the hygiene subchapter of the syntax extension...

Veykril

Repeating multiple things at once can be tricky, so going more in-depth on that topic would be nice. Also mentiong ways to avoid some problems would be helpful, for example...

Veykril

Annotated Examples

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The old book had an annotated examples section which basically was meant to show some more complex real world macros with comments explaining it more in-depth. See https://danielkeep.github.io/tlborm/book/aeg-README.html

Veykril